Add Community & Support section and update TASKS status

[sjquant]

Motivation

• Provide a clear community entry point in the docs so users can report bugs and ask questions, and reflect that work as completed in the task list.

Description

• Add a Community & Support section to docs/index.md with links to GitHub Issues and Discussions, and mark the corresponding item as DONE in specs/TASKS.md.

Testing

• No automated tests were run for this documentation-only change.

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Codex Task

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Note

Low Risk
Low risk documentation-only changes; no runtime code or behavior is affected.

Overview
Adds a new Community & Support section to docs/index.md with links to GitHub Issues (bug reports/feature requests) and GitHub Discussions (questions/ideas).

Updates specs/TASKS.md to mark the corresponding docs/discoverability task as [DONE].

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