live reload syntaxes

[andromeda-fp]

behaviour: when using cobalt serve, any added syntaxes don't get loaded until the server is restarted.

expected behavior: an added syntax is immediately reflected in the live server

steps to reproduce:

cobalt init
vim index.md
# add a syntax highlighted block like: 
# ```nix 
# {}: { inputs = { nixpkgs.url = ""; }; }
# ```
cobalt serve
mkdir _syntax
# download [Nix.sublime-syntax](https://github.com/satya-nutella/zola/blob/3bedb42b0b8ef06967eecaa63b8faa82dbe9cd00/sublime/syntaxes/extra/Nix.sublime-syntax#L4)
# and place it into _syntax
# notice at localhost:1024 that the syntax highlighting is not applied
# after `^c` `cobalt serve` the syntax is applied

[epage]

Thanks for reporting this! iirc this is generally true of non-page content. I would love to eventually transition to incremental rebuilds and include all content in that.