feat: yazi extra shortcuts

# Changes
## docs:
- Add extra tutorial docs
## Features:
- Add `pdf combine` to yazi
- Add `pdf normalization` to yazi
- Add `Markdown to html` to yazi
## Breaking Changes:
- Rename sops secret `wireguard/conf` to `wireguard/wg0.conf`: Make sure
update your `sops-conf.nix` and secrets file.

docs/fcitx.md

@@ -0,0 +1,8 @@
+# Fcitx Input Method
+
+## Frist Use
+
+### Enable Bopomofo
+
+Use shortcut `$mod + SPACE` cycle through input methods until Rime. Press
+`CTRL + Backtick` and select `注音`.