Add free SPA hosting information to documentation

[jhildenbiddle]

Free static SPA hosting is becoming increasingly common. Trustworthy hosts should be added to the documentation along with instructions for users who prefer using Docsify with routerMode set to 'history'.

For example:

• Azure
• Cloudflare
• Netlify

[SejalMukane]

Hi, I’d like to work on this issue if it’s still available. Please let me know if I can take it up.

[sy-records]

@SejalMukane yes