Take an initial crack at styling most of the Panettone application,
taking inspiration from the styles from todo.tvl.fyi and tvl.fyi itself.
This uses the LASS CSS library, after a brief attempt at using css-lite
which I ended up not going with because I don't like the library's
design very much, and also it's not compatible with sbcl's (safety
3) (some macroexpansions SETQ undeclared variables).
Change-Id: I054402e4c68ae1e99884d5164e6e2fc39d2779ff
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1350
Tested-by: BuildkiteCI
Reviewed-by: eta <eta@theta.eu.org>
