refactor(profile): anonymize portfolio and modernize org profile

[flitzrrr]

What & Why

Two goals for the public org profile:

1. No internal information leaked. The previous profile published details
   that read as confidential client work — a named industry sector, a specific
   legacy-mainframe platform, named products, and data-source specifics. This
   PR anonymizes all of it.
2. State-of-the-art presentation. Theme-adaptive header and accessibility,
   while keeping the bold, opinionated tone.

Changes

• Anonymized portfolio — Reframed the "Portfolio" project ledger as a
  generic "Capabilities" section:
  • Sector/industry name → removed.
  • Specific legacy-mainframe platform identifiers → "legacy mainframe stacks
    → modern JVM platforms".
  • Named consumer products → capability descriptions (e.g. "10-foot TV
    experience", "AI content pipelines").
  • Data-source / scraping specifics → "public-data aggregation".
  • "from our own projects" and other internal phrasing → removed.
  • Added a note: "Representative engagements, described generically. We don't
    publish client names or confidential project details."
• Theme-adaptive header — <picture> + prefers-color-scheme with a
  dedicated light-mode banner variant (the old fixed dark banner looked poor on
  GitHub light theme).
• Accessibility — alt text on the banner.
• Footer — added location line.

Stack and tech badges are generic technologies and were kept.

Impact

No functional/CI changes. Tables keep the existing compact style that already
passes the org's MegaLinter workflow. No new runtime dependencies (org profiles
have no contribution graph, so no stat widgets are introduced — the only
external assets are the capsule banner and shields.io badges, unchanged in
kind).

Testing

• Markdown linted against MegaLinter's default markdownlint config — clean
  (same table/HTML constructs as the currently-live, CI-passing profile).
• Verified no client-identifying terms remain
  (DB2, z/OS, PL/I, sector names, product names, scraping specifics).

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
⚠️ MARKDOWN	markdownlint	4		37	0	0.51s

Detailed Issues

⚠️ MARKDOWN / markdownlint - 37 errors

.github/PULL_REQUEST_TEMPLATE.md:1 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "## Summary"]
CONTRIBUTING.md:23 error MD040/fenced-code-language Fenced code blocks should have a language specified [Context: "```"]
CONTRIBUTING.md:58:33 error MD034/no-bare-urls Bare URL used [Context: "contact@klein.business"]
profile/README.md:1 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "<picture>"]
profile/README.md:24:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:24:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:24:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:24:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:90:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:90:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:90:16 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:90:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:90:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:90:11 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:101:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:101:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:101:16 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:101:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:101:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:101:11 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:113:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:113:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:113:16 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:113:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:113:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:113:11 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:124:6 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
profile/README.md:124:11 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
profile/README.md:124:16 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
profile/README.md:125:24 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
profile/README.md:125:103 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
profile/README.md:125:120 error MD060/table-column-style Table column style [Table pipe does not align with header for style "aligned"]
SECURITY.md:9:3 error MD034/no-bare-urls Bare URL used [Context: "security@klein.business"]
SECURITY.md:22:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
SECURITY.md:22:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
SECURITY.md:22:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
SECURITY.md:22:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]

Notices

📣 MegaLinter 9.5.0 is out! Discover the new features and security recommendations in the release announcement. (Skip this info by defining SECURITY_SUGGESTIONS: false)

See detailed reports in MegaLinter artifacts

You could have the same capabilities but better runtime performances if you use a MegaLinter flavor:

• oxsecurity/megalinter/flavors/formatters@v9.5.0 (19 linters)
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Your project could benefit from a custom flavor, which would allow you to run only the linters you need, and thus improve runtime performances. (Skip this info by defining FLAVOR_SUGGESTIONS: false)

• Documentation: Custom Flavors
• Command: npx mega-linter-runner@9.5.0 --custom-flavor-setup --custom-flavor-linters MARKDOWN_MARKDOWNLINT

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