[FEATURE] Add button to clear browser cache

[bj00rn]

Your feature request. Please describe. What is the feature, why is it valuable to the community or application? Add button to clear browser cache.

Sometimes the browser need a hard refresh to clear cache when installing home assistant integrations (dwains dashboard for example) in order for custom elements to be found. Clearing cache for application in android settings does not seem to have that effect.

MQTT support for clearing cache works fine so hopefully this would be an easy fix