* CI: free disk space before running nix flake check

* disable cleaning dotnet and large-packages in nix CI free-disk-space

It didn't quite work, now it started failing altogether.

Make docs deploy faster. Also don't build --release separately, it's covered by
the randomized-tests job.

* Add wiki based on mkdocs

* wording fixes

* fix github bg color on narrow

* Fix left sidebar section headers being bigger than pages

* fix hover accent

* fix list rendering on fractional layout

* fix videos

* fix automatic full links

* remove redundant commented css

* improve dark mode contrast

* update pygments for better child node coloring

* update logo

* remove blank lines

* add systemd language hint

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Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* feat(ci): add FreeBSD job

* Update .github/workflows/ci.yml

* fix(workflow): remove 10m timeout for freebsd job, put it back later if there is an actual reason

* feat(workflow): enable cache on freebsd job

* feat(workflow): add custom CARGO_HOME for freebsd job

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* clean-up

* test cache

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Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* ci: add musl build

* Update .github/workflows/ci.yml

* Update .github/workflows/ci.yml

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Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>