Move the website to something tut + markdown based

[olafurpg]

The current website http://scalameta.org/scalafmt/ is built with scalatex (http://www.lihaoyi.com/Scalatex/). While I've personally found scalatex to be pretty great, the unorthodox markup language is a barrier for contributors. I would love to migrate the website to something tut + markdown based.

Copy-paste from #1144

I've tried hugo, gitbook, docusaurus, jekyll, ornate, doxidize, sphinx, read the docs, mkdocs but struggled to get

• github-flavored markdown
• mobile friendly
• always accessible sidebar to jump between pages
• always accessible TOC for open page
• search (either generated in site or algolia is fine too)
• "edit on github" links
• anchor refs to headers for easy "click and share link to section"
• template variable splicing to insert dynamic strings like project version (for copy-paste friendly installation instructions).
• ability to inline subsets of external files, like @hl.ref in http://www.lihaoyi.com/Scalatex/#Highlighter (ideally with link to original file on github)
• fast edit/preview feedback loop
• nice landing page, something like https://docusaurus.io/ or https://bucklescript.github.io/
• (optional) single page pdf generation

I can configure tut integration and publish to ghpages with mostly anything, and also port the existing scalatex pages to markdown + tut. My failure is a bigger sign of my experience with html/css than lack of functionality in those site generators 😅

[olafurpg]

PS. We are working on setting up a site for metals in https://github.com/scalameta/metals/pull/294 thanks to @gabro . I would love to reuse the same setup for

• http://scalameta.org/metals
• http://scalameta.org/
• http://scalameta.org/tutorial
• http://scalameta.org/scalafmt
• http://scalameta.org/metadoc (and move code browser demo to another subpage)
• https://scalacenter.github.io/scalafix/

[gabro]

This is now live!