docs: minor tweaks and fixes (#740)

* docs: enable math via KaTeX

* docs: move getting started to first pos

* docs: remove IP prefix from docker compose ports

* docs: improve wording for describing volumes key

* docs: update links

* docs: more codeblock highlights

* chore: updated dictionary.txt

* chore: nix fmt

* chore: nix fmt

* chore: updated npmDepsHash