readme: add manual installation section

README.md

@@ -37,6 +37,86 @@ git clone https://github.com/caelestia-dots/caelestia.git ~/.local/share/caelest
 ~/.local/share/caelestia/install.fish
 ```
 
+### Manual installation
+
+Dependencies:
+
+-   hyprland
+-   xdg-desktop-portal-hyprland
+-   xdg-desktop-portal-gtk
+-   hyprpicker
+-   hypridle
+-   wl-clipboard
+-   cliphist
+-   bluez-utils
+-   inotify-tools
+-   app2unit
+-   wireplumber
+-   trash-cli
+-   foot
+-   fish
+-   fastfetch
+-   starship
+-   btop
+-   jq
+-   socat
+-   imagemagick
+-   curl
+-   adw-gtk-theme
+-   papirus-icon-theme
+-   qt5ct
+-   qt6ct
+-   ttf-jetbrains-mono-nerd
+
+Install all dependencies and follow the installation guides of the
+[shell](https://github.com/caelestia-dots/shell) and [cli](https://github.com/caelestia-dots/cli)
+to install them.
+
+> [!TIP]
+> If on Arch or an Arch-based distro, there is a meta package available in the AUR
+> that pulls in all dependencies (`caelestia-meta`).
+
+Then copy or symlink the `hypr`, `foot`, `fish`, `fastfetch`, `uwsm` and `btop` folders to the
+`$XDG_CONFIG_HOME` (usually `~/.config`) directory. e.g. `hypr -> ~/.config/hypr`.
+Copy `starship.toml` to `$XDG_CONFIG_HOME/starship.toml`.
+
+#### Installing Spicetify configs:
+
+Follow the Spicetify [installation instructions](https://spicetify.app/docs/advanced-usage/installation),
+copy or symlink the `spicetify` folder to `$XDG_CONFIG_HOME/spicetify` and run
+
+```sh
+spicetify config current_theme caelestia color_scheme caelestia custom_apps marketplace
+spicetify apply
+```
+
+#### Installing VSCode/VSCodium configs:
+
+Install VSCode or VSCodium, then copy or symlink `vscode/settings.json` and
+`vscode/keybindings.json` into the `$XDG_CONFIG_HOME/Code/User` (or `$XDG_CONFIG_HOME/VSCodium/User`
+if using VSCodium) folder. Then copy or symlink `vscode/flags.conf` to `$XDG_CONFIG_HOME/code-flags.conf`
+(or `$XDG_CONFIG_HOME/codium-flags.conf` if using VSCodium).
+
+Finally, install the extension VSIX from `vscode/caelestia-vscode-integration`.
+
+```sh
+# Use `codium` if using VSCodium
+code --install-extension vscode/caelestia-vscode-integration/caelestia-vscode-integration-*.vsix
+```
+
+#### Installing Zen Browser configs:
+
+Install Zen Browser, then copy or symlink `zen/userChrome.css` to the `chrome` folder in your
+profile of choice in `~/.zen`. e.g. `zen/userChrome.css -> ~/.zen/<profile>/chrome/userChrome.css`.
+
+Now install the native app by copying `zen/native_app/manifest.json` to
+`~/.mozilla/native-messaging-hosts/caelestiafox.json` and replacing the `{{ $lib }}` string in it
+with the absolute path of `~/.local/lib/caelestia` (this must be the absolute path, e.g.
+`/home/user/.local/lib/caelestia`). Then copy or symlink `zen/native_app/app.fish` to
+`~/.local/lib/caelestia/caelestiafox`.
+
+Finally, install the CaelestiaFox extension from [here](https://addons.mozilla.org/en-US/firefox/addon/caelestiafox).
+
 ## Updating
 
 Simply run `yay` to update the AUR packages, then `cd` into the repo directory and run `git pull` to update the configs.