``--`` does not play nice and always displays "-" instead of the intended "--"

--page is not a valid subcommand of `cover`

Added a table to better show which options are allowed

t-softdrop does not provide 180 spin capabilities, run the following in sfinder v1.41+:
``java -jar sfinder.jar percent -t v115@9gC8CeH8BeI8BeH8AeD8JeAgH -p TT -K "@nullpomino180" -d t-softdrop
java -jar sfinder.jar percent -t v115@9gC8CeH8BeI8BeH8AeD8JeAgH -p TT -K "@nullpomino180" -d 180``

duplicate of file in \sfinder\

fixed image linking
use <figure> instead of <div>s

copyediting, fix broken figure

copyediting
also added more ways to mitigate having duplicate pieces in bags

link to github instead of discordapp.com

This fixes broken mino images in local builds.
The root of github page is hsterts.github.io, but the local served quartz is already inside the h-docs subdirectory.

fix linking

added t-spin related options
I am unable to integrate hugo partials of html files to markdown files, or use shortcodes to add the html into the markdown files. It would be nice if I could do that to re-use the table in different sfinder commands.

prevent -- from merging into single dash

copyediting
fix links

use `t-spin-table` to show the extra t-spin drop options that are only available to some commands
also hold and drop are not valid subcommands of spin

--H > -H
--t > -t