feat(stremio): add official stremio seasonal addons to addon list

docs/stremio/addons/christmas-movies.mdx

@@ -0,0 +1,15 @@
+---
+title: Christmas Movies
+description: An official Stremio catalogue providing movies fit for Christmas.
+keywords: [stremio, addons, addon, official, christmas, install, link]
+tags: [stremio-addon, stremio-addon:catalogues, stremio-addon:official]
+---
+```mdx-code-block
+import StremioAddonButtons from '@site/src/components/StremioAddonButtons';
+
+<StremioAddonButtons id="christmas-movies" manifest="https://cinemeta-catalogs.strem.io/christmaspopular/manifest.json"/> 
+```
+
+<h3>Description</h3>
+
+This is an official Stremio catalogue providing movies fit for Christmas. It appears in a pop-up during Christmas.

docs/stremio/addons/halloween-popular.mdx

@@ -0,0 +1,15 @@
+---
+title: Halloween Movies
+description: An official Stremio catalogue providing movies fit for Halloween.
+keywords: [stremio, addons, addon, official, halloween, install, link]
+tags: [stremio-addon, stremio-addon:catalogues, stremio-addon:official]
+---
+```mdx-code-block
+import StremioAddonButtons from '@site/src/components/StremioAddonButtons';
+
+<StremioAddonButtons id="halloween-movies" manifest="https://cinemeta-catalogs.strem.io/halloweenpopular/manifest.json"/> 
+```
+
+<h3>Description</h3>
+
+This is an official Stremio catalogue providing movies fit for Halloween. It appears in a pop-up during Halloween.

docs/tags.yml

@@ -1,5 +1,8 @@
 stremio-addon:
   label: Stremio Addon
+stremio-addon:official:
+  label: Official
+  description: Addons that are officially maintained by Stremio.
 stremio-addon:usenet-streams:
   label: Usenet Streams
   description: Addons that provide Usenet links for Stremio.