docs: drop v1 X-prefix kind recommendation from XRD docs - #1134

Changed pages include:

• 404.html - view
• contribute/index.html - view
• latest/index.html - view
• master/index.html - view
• v1.20/index.html - view
• v2.1/index.html - view
• v2.2/index.html - view
• v2.3/index.html - view
• cli/latest/index.html - view
• cli/master/index.html - view

There are more changes not included in the list