Add listen-ereader go binary

I removed the listen-ereader.py program in
fa95653eeb0f6d3f234c8384fee2c49095e734fa and replaced it with the
program built by https://git.sr.ht/~rensoliemans/listen-ereader, but
it also makes sense to add that binary in this project, since
./install.sh will install it appropriately as well.

Remove listen-ereader

See system/74229ff.

[0]: https://git.sr.ht/~rensoliemans/system/commit/74229ffc9f7b130dcbd0e7d3694f99e3c64dbe6c

focus-or-launch: add calendar option

rofi: add rofi-[power|wifi|brightness]-menu

edit: add script

This script edits a file (usually an executable) which is in PATH.

random-number: add script

I need a random number of this size for developing, occasionally.

focus-or-launch: improve script

determine-player: also detect mpd

focus-emacs: start using systemd

fix-duplicates: possibly pass hostname

mpris: improve mpris/pplayerctl commands

getlyrics.py: add script

This uses lyricsgenius [0] to get the lyrics, puts it in a textfile
`/tmp/lyricsbyrens` and calls `xdg-open /tmp/lyricsbyrens`. It's
really hacky now, but I like it.

[0]: https://pypi.org/project/lyricsgenius/

Add (originally Kyle Howells') py3 script add-chapters-to-video.py

From https://ikyle.me/blog/2020/add-mp4-chapters-ffmpeg, but
significantly rewritten. This is squashed from another repo in 3
commits, commit messages concatenated:

Refactor script

- Make filenames passable by commandline
- Don't append CHAPTERS if they already exist in the ffmetadata
  file (unless --force is passed)
- Add better error messages if we can't correctly parse the chapters
  file.

Fix last chapter

Previously the script didn't parse the last chapter, presumably since
the end time wasn't defined. This is because the end time was defined
as the start time of the _next_ chapter - 1, which doesn't exist for
the last chapter.

This commit sets the end time of the last chapter to be the start time
+ 1. That doesn't really make sense, since it then only lasts for a
millisecond. However, doing it otherwise means that we should parse
the videofile (I think), and I have no intention to do that.

canary: add script

This script checks the canary notice of rsync.net [0], specifically
whether it says what I expect. When fails, it currently creates a
random file that I will notice. This is quite ugly, but it works well
enough.

[0]: https://www.rsync.net/resources/notices/canary.txt

focus-or-launch: add script

Currently only works for app_id. This is quite lacking, since a lot of
windows don't have an app_id, or the app_id isn't identical to the
program that should be started. Ideally you'd like to specify this,
but that can be added in the future.

floating: add script to open window as floating in sway

From DeityLamb,
https://gist.github.com/DeityLamb/01def51d9e01cf234d7acbfa676072f0

Fix (remove) maildir duplicates

Quite an ugly script, but it works.

Update random-image

Add caffeine

This script stops or continues swayidle. It uses zsh because I'm
having some trouble with regular expressions in bash.

sourcehut: don't automatically replace remote