docs: beets, khal, nemo, wf-recorder

.dotfiles/docs/beets.md

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+# Beets
+
+## Setup configuration file:
+
+``` yaml
+# ~/.config/beets/config.yaml
+directory: ~/music
+library: ~/music/library.db
+import:
+  copy: no   # Do not copy files into directory
+  move: no   # Do not delete original files
+  write: yes # Write tags to file
+plugins: duplicates fetchart embedart
+```
+
+## Import music
+
+Using `--incremental` to avoid scanning the already imported albums.
+
+```
+beet import ~/music --incremental
+```
+
+To re-scan the music library:
+
+```
+beet update
+```
+
+## Download art files into a `cover.jpg` file
+
+Requires plugin: `fetchart`.
+
+```
+beet fetchart
+```
+
+## Embed art into files
+
+Requires plugin: `embedart` & `fetchart`.
+
+```
+beet embedart
+```
+
+## Scan for duplicates
+
+Requires plugin `duplicates`.
+
+Use `-p` to show the path to the duplicates instead of the name.
+
+```
+beet duplicates -p
+```

.dotfiles/docs/khal.md

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+# Khal
+
+## Get only next event
+
+```
+# -df "": Show empty day headers
+# grep -v "^ ": remove all-day events
+# head -n 1: Get only the first item
+khal list now -df "" | grep -v "^ " | head -n 1
+```

.dotfiles/docs/nemo.md

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+# Nemo
+
+## Samba support
+
+```
+# pacman -S nemo-share gvfs-smb 
+```

.dotfiles/docs/wf-recorder.md

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+# wf-recorder
+
+## Record screen geometry
+
+Requires [slurp](https://github.com/emersion/slurp)
+
+```
+wf-recorder -g "$(slurp)"
+```