Vitepress build

[hamishwillee]

This is vitepress build from mavlink/MAVSDK-docs#292 adjusted to deploy from MAVSDK repo. It adds the docs to build into /docs/ tree.

Still to do

• Fix up notes, tips, warnings
• Check/Fix the script for generating references so it doesn't have any cases of HTML element tags (happens in a few places where things like <someobject> are in a description outside of a code block. Maybe just fix the instances - can be found in Vitepress test branch MAVSDK-docs#292
• Make api ref docs in CI build into github docs tree - annoying to have build artifacts in repo but safer.
• Add access token for CI - done
• Test workflow action for building. Make sure reference builds before main docs
• Disable old repo

This can be tested locally by cloning, then from root doing:

yarn install
yarn start

Then view in browser.

[sonarqubecloud]

Quality Gate passed

Issues
6 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud