😜 Gitmoji plugin (#144)

### Gitmoji

_List gitmojis and copy them._

Note: You need to have
[wl-clipboard](https://github.com/bugaevc/wl-clipboard) installed on
your system.

**Related config keys**

```yml
# ~/.config/centerpiece/config.yml
plugin:
  gitmoji:
    enable: false
```

This resolves #21.

README.md

@@ -119,8 +119,9 @@ To avoid delays in the plugin launch time this plugin comes with a systemd servi
 This index file is located at `~/.cache/centerpiece/git-repositories-index.json` and necessary for the plugin to work.
 
 It exports the following environment variables:
+
 - `$GIT_DIRECTORY`: The path to the git directory.
-- `$GIT_DIRECTORY_NAME`:  The name of the git directory.
+- `$GIT_DIRECTORY_NAME`: The name of the git directory.
 
 If `zoxide` integration is enabled, the plugin will sort your projects based on their respective `zoxide` scores.
 
@@ -137,6 +138,21 @@ plugin:
       - ["alacritty", "--working-directory", "$GIT_DIRECTORY" "--class" "$GIT_DIRECTORY_NAME"]
 ```
 
+### Gitmoji
+
+_List gitmojis and copy them._
+
+Note: You need to have [wl-clipboard](https://github.com/bugaevc/wl-clipboard) installed on your system.
+
+**Related config keys**
+
+```yml
+# ~/.config/centerpiece/config.yml
+plugin:
+  gitmoji:
+    enable: false
+```
+
 ### System Commands
 
 _Lock, sleep, restart or shutdown your system._
@@ -235,6 +251,8 @@ You can specify alternative configuration locations through:
        commands:
          - ["alacritty", "--command", "nvim", "$GIT_DIRECTORY"]
          - ["alacritty", "--working-directory", "$GIT_DIRECTORY"]
+     gitmoji:
+       enable: false
      resource_monitor_battery:
        enable: true
      resource_monitor_cpu:
@@ -287,6 +305,9 @@ You can specify alternative configuration locations through:
                                ["alacritty" "--working-directory" "$GIT_DIRECTORY"]
                            ];
                        };
+                       gitmoji: {
+                           enable = false;
+                       };
                        resource_monitor_battery = {
                            enable = true;
                        };

client/src/main.rs

@@ -189,6 +189,12 @@ impl Application for Centerpiece {
             >());
         }
 
+        if self.settings.plugin.gitmoji.enable {
+            subscriptions.push(crate::plugin::utils::spawn::<
+                crate::plugin::gitmoji::GitmojiPlugin,
+            >());
+        }
+
         if self.settings.plugin.resource_monitor_battery.enable {
             subscriptions.push(crate::plugin::utils::spawn::<
                 crate::plugin::resource_monitor::battery::BatteryPlugin,