chore(ci): add MegaLinter integration

[flitzrrr]

Summary

• Add MegaLinter CI workflow (.github/workflows/megalinter.yml)
• Add MegaLinter config (.mega-linter.yml) with VALIDATE_ALL_CODEBASE: true
• Linters configured for the repo's tech stack

Test plan

• MegaLinter CI run passes on this PR

[github-actions]

✅⚠️MegaLinter analysis: Success with warnings

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
⚠️ MARKDOWN	markdownlint	1		15	0	0.34s

Detailed Issues

⚠️ MARKDOWN / markdownlint - 15 errors

profile/README.md:1 error MD041/first-line-heading/first-line-h1 First line in a file should be a top-level heading [Context: "<div align="center">"]
profile/README.md:3:1 error MD045/no-alt-text Images should have alternate text (alt text)
profile/README.md:74:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:74:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:74:16 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:74:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:74:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:74:11 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:87:6 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:87:11 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:87:16 error MD060/table-column-style Table column style [Table pipe is missing space to the left for style "compact"]
profile/README.md:87:1 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:87:6 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:87:11 error MD060/table-column-style Table column style [Table pipe is missing space to the right for style "compact"]
profile/README.md:106:1 error MD045/no-alt-text Images should have alternate text (alt text)

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@v9.4.0 (19 linters)
• oxsecurity/megalinter/flavors/documentation@v9.4.0 (51 linters)
• oxsecurity/megalinter/flavors/ruby@v9.4.0 (52 linters)

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@9.4.0 --custom-flavor-setup --custom-flavor-linters MARKDOWN_MARKDOWNLINT

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