v4.1.0: Proxy refresh event with onUpdated instead of webNavigation API

docs: bump manifest version to 4.0.1

v4.0.0: Migrate to manifest v3

v3.3.2: minor fixes from Discord update

v3.3: fixes autohiding channels not working after discord update

v3.2: update code to use Vanilla javascript for Firefox support

v3.1: support Firefox, revamp architecture to support auto initialisi…

…ng extension when moving from Discord non-chat page (like homepage) to chat page

v3.0: add extension popup menu to customise extension behaviour

* Dropdown Menu when Extension Icon is clicked (resolves #4)
    * Enable/disable extension
    * Enable/disable autohiding servers
    * Enable/disable autohiding channels
    * Specify small window width that servers/channels will autohide
    * Donate/Support button
* Remember whether servers list is hidden/shown in the Discord UI (resolves #5)
    * Only applies when server autohide is disabled

v2.17: update extension description for SEO

v2.16: fixes extra space on the right of sidebar after discord update

Screenshot of bug: https://imgur.com/a/GNcE0oW