feat: Write built in themes to the themes file on first run so users can define custom themes

themes/README.md

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+# Managarr Themes
+The Managarr TUI can be customized to look how you like with various themes.
+
+There are a few themes included by default with Managarr and are added to your `themes.yml`
+on first startup. You can simply add more custom themes as you wish to this file.
+
+## Table of Contents
+- [Built In Themes](#built-in-themes)
+- [Creating a Custom Theme](#creating-a-custom-theme)
+
+## Built-In Themes
+Managarr ships with a handful of built-in themes that you can either use or base your own
+custom theme off of. The following themes are included by default:
+
+### [Default](./default/README.md)
+![sonarr-library](./default/sonarr_library.png)
+
+### [Dracula](./dracula/README.md)
+![sonarr-library](./dracula/sonarr_library.png)
+
+### [Watermelon Dark](./watermelon-dark/README.md)
+![sonarr-library](./watermelon-dark/sonarr_library.png)
+
+## Creating a Custom Theme
+To create a custom theme, you will need to add a new entry to the `themes.yml` file. If you decide not to add it to the
+`themes.yml` file, you can also specify a different file to load themes from using the `--themes-file` argument.
+
+Themes are customizable using hex color codes for the various elements of the TUI. The following
+is an example that shows every available customization option for a custom theme:
+
+```yaml
+- name: my-theme
+  theme:
+    background:
+      enabled: true # Disable for transparent backgrounds
+      color: "#233237"
+    awaiting_import:
+      color: "#FFAA42"
+    indeterminate:
+      color: "#FFAA42"
+    default:
+      color: "#FFFFFF"
+    downloaded:
+      color: "#00FF00"
+    downloading:
+      color: "#762671"
+    failure:
+      color: "#DE382B"
+    help:
+      color: "#00FFFF"
+    missing:
+      color: "#DE382B"
+    primary:
+      color: "#2CB5E9"
+    secondary:
+      color: "#FFC706"
+    success:
+      color: "#39B54A"
+    system_function:
+      color: "#FFC706"
+    unmonitored:
+      color: "#808080"
+    unmonitored_missing:
+      color: "#FFC706"
+    unreleased:
+      color: "#00FFFF"
+    warning:
+      color: "#FF00FF"
+```
+
+In order to activate your custom theme, you can either update your `config.yml`:
+
+```yaml
+theme: my-theme
+radarr:
+  ...
+sonarr:
+  ...
+```
+
+Or you can test out your theme via the `--theme` flag on the CLI:
+
+```shell
+managarr --theme my-theme
+```
+
+If you're developing your own theme and don't want to add it to the main `themes.yml` file, you can
+also use the `--themes-file` argument to specify a different file to load themes from:
+
+```shell
+managarr --themes-file /path/to/my/testing-themes.yml
+```

themes/default/README.md

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+# Managarr Default Theme
+The [themes.yml](./themes.yml) file in this directory corresponds to the theme configuration for the 
+default Managarr theme.
+
+## Screenshots
+
+![sonarr-library](./sonarr_library.png)
+![manual-episode-search](./manual_episode_search.png)
+![radarr-system](./radarr_system.png)

themes/default/themes.yml

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+- name: default
+  theme:
+    background:
+      enabled: true
+      color: "#233237"
+    awaiting_import:
+      color: "#FFAA42"
+    indeterminate:
+      color: "#FFAA42"
+    default:
+      color: "#FFFFFF"
+    downloaded:
+      color: "#00FF00"
+    downloading:
+      color: "#762671"
+    failure:
+      color: "#DE382B"
+    help:
+      color: "#00FFFF"
+    missing:
+      color: "#DE382B"
+    primary:
+      color: "#2CB5E9"
+    secondary:
+      color: "#FFC706"
+    success:
+      color: "#39B54A"
+    system_function:
+      color: "#FFC706"
+    unmonitored:
+      color: "#808080"
+    unmonitored_missing:
+      color: "#FFC706"
+    unreleased:
+      color: "#00FFFF"
+    warning:
+      color: "#FF00FF"

themes/dracula/README.md

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+# Managarr Dracula Theme
+The [themes.yml](./themes.yml) file in this directory corresponds to the theme configuration for the
+Dracula Managarr theme.
+
+## Screenshots
+
+![sonarr-library](./sonarr_library.png)
+![manual-episode-search](./manual_episode_search.png)
+![radarr-system](./radarr_system.png)

themes/dracula/themes.yml

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+- name: dracula
+  theme:
+    background:
+      enabled: false
+      color: "#282a36"
+    default:
+      color: "#f8f8f2"
+    downloaded:
+      color: "#50fa7b"
+    downloading:
+      color: "#8be9fd"
+    failure:
+      color: "#ff5555"
+    missing:
+      color: "#ffb86c"
+    unmonitored-missing:
+      color: "#6272a4"
+    help:
+      color: "#6272a4"
+    primary:
+      color: "#ff79c6"
+    secondary:
+      color: "#ff79c6"
+    success:
+      color: "#50fa7b"
+    warning:
+      color: "#f1fa8c"
+    unreleased:
+      color: "#f8f8f2"

themes/watermelon-dark/README.md

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+# Managarr Watermelon Dark Theme
+The [themes.yml](./themes.yml) file in this directory corresponds to the theme configuration for the
+Watermelon Dark Managarr theme.
+
+## Screenshots
+
+![sonarr-library](./sonarr_library.png)
+![manual-episode-search](./manual_episode_search.png)
+![radarr-system](./radarr_system.png)

themes/watermelon-dark/themes.yml

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+- name: watermelon-dark
+  theme:
+    background:
+      enabled: false
+    default:
+      color: "#00FF00"
+    downloaded:
+      color: "#80ffbf"
+    failure:
+      color: "#ff8080"
+    missing:
+      color: "#ff8080"
+    primary:
+      color: "#ff19d9"
+    secondary:
+      color: "#8c19ff"