Removes old/unsed files:

• swagger.properties (Old and definitely not needed now that the API directory is going away)
  • https://github.com/stolostron/rhacm-docs/blob/2.11_stage/swagger.properties
• Symlink to modules/ inside of the modules/ directory (which causes an infinite recursion since it's a link to itself)
  • https://github.com/stolostron/rhacm-docs/blob/2.11_stage/modules/modules

Updates:

• Fix old or broken GRC links
  • https://github.com/stolostron/rhacm-docs/blob/5b1714240f47c60e0575ad67fa0e084d35f332ef/governance/grc_intro.adoc?plain=1#L15
  • https://github.com/stolostron/rhacm-docs/blob/5b1714240f47c60e0575ad67fa0e084d35f332ef/governance/third_party_policy_intro.adoc?plain=1#L6

PR: https://github.com/stolostron/rhacm-docs/pull/6381