October Prebuild (#15325)

* Add october background

* Add armoire

* Add subscriber gear

* add new pet

* improve quest tests

* Fixes from gear switchup

* use new sprite system for quest images

* fixes

* fix quest image alignment

* add missing string

* fix(style): lint warnings and typo

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Co-authored-by: Phillip Thelen <phillip@habitica.com>
Co-authored-by: Sabe Jones <sabe@habitica.com>

website/common/script/content/constants/schedule.js

@@ -527,6 +527,7 @@ export const MONTHLY_SCHEDULE = {
           'rock',
           'ferret',
           'hedgehog',
+          'dog',
         ],
       },
       {