chore: move redirects for various domains to cloudflare

[mcdurdin]

• keymandesktop.com
• help.keymandesktop.com
• keymandeveloper.com
• help.keymandeveloper.com
• help.keymanweb.com
• keyman.dev
• keyman.blog

[mcdurdin]

Note that some of these domains are referred to in code, so they should continue to resolve, not be retired.