fix puppet-api wording and nav list

[tuxmea]

Short description

• add missing links to nav list
• rename from Puppet to OpenVox - where applicable
• remove old http_api_index in server
• point to http_api_index in openvox tree
• remove docs for API v1 und v2
• fix github links to pint to openvoxproject

Checklist

I have:

• read the CONTRIBUTING.md document
• read and accepted the Developer Certificate of Origin document and added a Signed-off-by annotation to each of my commits
• read and accepted the AI Policy document and added Generated-by or Assisted-by annotations to each of my commits created with the help of an AI agent
• tested this code

[miharp]

Thanks for the cleanup — the nav additions and rebranding look good. One thing I want to flag before merging:

Checked these on the live server and they're all 404:

File	Broken link	Resolves to
services_puppetserver.markdown	../openvox/latest/http_api/http_api_index.html (×2)	/openvox-server/openvox/latest/... → 404
services_puppetserver.markdown	../openvox/latest/environments_about.html	/openvox-server/openvox/latest/... → 404
services_puppetserver.markdown	../openvox/latest/config_file_main.html	/openvox-server/openvox/latest/... → 404
config_file_master.markdown	../openvox/latest/http_api/http_api_index.html (×2)	/openvox-server/openvox/latest/... → 404
puppet-api/v3/environment_transports.markdown	../../../openvox/latest/http_api_index.html	/openvox-server/openvox/latest/... → 404

Should we switch these to absolute paths for cross-collection links? Since the correct number of ../ hops varies depending on how deep the source page is, absolute paths seem less error-prone here.