Update documentation to include --update-only flag

[Gyan-max]

• Added titles to README.md, CONTRIBUTING.md, and CHECKERS.md to ensure proper linking in Sphinx documentation.
• Corrected paths for sbom/sboms_for_humans/index and sbom/sboms_for_humans/README in index.rst.
• Updated index.rst to include the new --update-only flag description.
• Verified and rebuilt the documentation to resolve warnings related to missing titles and incorrect paths.

This commit ensures that the documentation is correctly generated with all necessary links and resolves the warnings encountered during the Sphinx build process.

[terriko]

Looks like you accidentally checked in a whole _build/ directory that will need to be removed from this PR. You might want to add _build/ to .gitignore to avoid it happening again (or just remember that git add * is never your friend!)

[Gyan-max]

Hi @terriko
Can you guide me on this. I am getting confused in which branch I pushed my code and I think I again made some mistakes while committing.
Please review my commits and guide me over this.

[JigyasuRajput]

Hey @Gyan-max! A quick fix would be to create a new branch and commit only the necessary changes. Also, when using "git add .", be careful—it adds all modified files, including the build ones.

[terriko]

You can actually check the branch at the top of the github web interface: it says it's Gyan-max:feature/update-only-flag

Given how many files there are you need to remove from this PR, you might actually find it easier to make a new branch and new pr and just be careful about what files are checked in.