[FEATURE] Add support for Fuse.js

[nopdan]

Add support for Fuse.js

• Feature 1
  Fuse.js has the benefits of both lunr and algolia.
  It's more efficient than algolia and has higher performance than lunr.

[victor-pogor]

Hi @cxcn. Good idea.

I'll try to integrate this search library when I'll have the free time 😉

Thanks.

[davised]

FYI there is another LoveIT based theme that has fuse.js implemented: https://github.com/HEIGE-PCloud/DoIt