[RHIDP-11720] Convert to knowledge repository

[Jdubrick]

What does this PR do?:

From RHDH 1.10 and onwards, we will no longer be maintaining our own image. As a result, building a llama stack image from this repository is no longer needed and we only care about the configuration file(s). Due to this, I am proposing a refactor to meet our needs moving forward:

• Remove image building from main
• Add compose functionality to easily spin up sidecars locally to test APIs
• Add new release process for ensuring we separate the Llama Stack configuration files by RHDH release. This lets us provide support for them individually when we go GA
• Refactors a bunch of documentation
• Adds PR checks for yaml formatting

Which issue(s) this PR fixes:

https://issues.redhat.com/browse/RHIDP-11720

PR acceptance criteria:

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened and linked to this PR, if they are not in the PR scope due to various constraints.

• Tested and Verified

• Documentation (READMEs, Product Docs, Blogs, Education Modules, etc.)

How to test changes / Special notes to the reviewer:

[maysunfaisal]

is it possible to make the image configurable via ENV, dont know how to do it via podman compose

[Jdubrick]

let me look into that @maysunfaisal

[maysunfaisal]

lgtm, just a general ques

[Jdubrick]

Closing PR in favour of moving this stuff to a new repo, you can follow the Slack thread here: https://redhat-internal.slack.com/archives/C08DZMUKU6R/p1772817872824399

fyi @gabemontero @maysunfaisal