Replace baseURL links in kb-chaoss-community.md with Hugo ref syntax

[santhosh-7777]

This PR updates internal content links in kb-chaoss-community.md to use Hugo ref syntax instead of {{ baseURL }} references.
Changes were intentionally limited to a small validation scope as discussed in #29, to confirm the migration strategy works consistently before applying broader repository wide replacements.

[santhosh-7777]

Hi @MoralCode , I have completed the initial validation update for kb-chaoss-community.md by replacing the selected internal {{ baseURL }} links with Hugo ref syntax as discussed in #29.
The scope was intentionally kept small to verify the migration approach before applying broader replacements across the repository. Please let me know if any adjustments are needed before proceeding further.

[MoralCode]

im seeing errors when trying to build the site locally with hugo server

ERROR [en] REF_NOT_FOUND: Ref "kb-getting-started/": "[redacted]/hugo/content/kb-chaoss-community.md:150:7": page not found
ERROR [en] REF_NOT_FOUND: Ref "kbtopic/how-to-contribute/": "[redacted]/hugo/content/kb-chaoss-community.md:25:16": page not found
ERROR [en] REF_NOT_FOUND: Ref "kbtopic/templates/": "[redacted]/hugo/content/kb-chaoss-community.md:57:20": page not found
ERROR [en] REF_NOT_FOUND: Ref "kbtopic/chaoss-groups/": "[redacted]/hugo/content/kb-chaoss-community.md:86:26": page not found
ERROR [en] REF_NOT_FOUND: Ref "kbtopic/media-and-outreach/": "[redacted]/hugo/content/kb-chaoss-community.md:114:30": page not found

I think it may be worth looking at the docs to see if the ref tag is expecting the path to the underlying markdown file for the page, or the public-facing url to it (these two arent always the same)

We also havent migrated over any of the KB pages yet (the majority of the links here seem to be going to kbtopic pages). See #25 for the discussion on migrating the knowledgebase content (although thats going to be a very technical topic and not one id recommend for a first-time contributor