feat: Added the Eldritch theme and updated documentation

themes/eldritch/README.md

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