feat: new website

[tivac]

Description

I built a new m-css.com site with an improved REPL, an actual homepage, and something approximating an actual guide.

Motivation and Context

m-css.com was too hard to update because it used webpack & mithril. New site uses rollup & svelte and is easier to follow/tweak because of it. Also set up on netlify now so it can auto-deploy when pushes to master happen.

How Has This Been Tested?

Lots of local testing, along with https://m-css.netlify.com

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #557 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #557   +/-   ##
=======================================
  Coverage   98.94%   98.94%           
=======================================
  Files          46       46           
  Lines        1045     1045           
  Branches      162      162           
=======================================
  Hits         1034     1034           
  Misses         11       11

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