WIP [enh] output website: javascript is not mandatory

[dalf]

The --output parameter new references a directory.

Clearly unfinished. The html directory will be removed once finished.

Framework:

• ~~use Jinja2~~
• use referenced static files include sha256, so a new version is reloaded (can support subresource integrity not sure if it creates more problem than it helps)
• create .br files (compressed with brotli), so the web server can serve these files directly.

Will fix https://github.com/dalf/searx-stats2/issues/9

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Update:

• will use preact with pre-rendering
• one implementation.
• the pages are prerendered can be seen without javascript.
• when there is javascript, filters / sort order can work.

[dalf]

In case preact doesn't fit:

• https://vuejsdevelopers.com/2017/04/01/vue-js-prerendering-node-laravel/
• https://dev.to/veebuv/5-extremely-easy-ways-to-drastically-improve-your-vuejs-app-s-speed-5k0
• https://purecss.io/