Updated sig-docs blog subproject readme

[KashishV999]

Updated Blog subproject README :

• Meetings: Replaced outdated reference to biweekly/fortnightly editorial meetings (which no longer take place) with a pointer to the existing SIG Docs meetings
• Writing buddies: Added the Blog writing buddies role with a link to the official documentation
• Shadow roles: Kept shadow approver and shadow editor roles as-is , they are currently unfilled but preserved in case someone wants to pick them up in future

Reference : Based on the discussion : sig-docs-blog

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: KashishV999
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