An easy user-togglable dark mode for Rocket.Chat

This repo was migrated for ease of collaboration from my gist which was a fork of chall8909's gist, to which this project is greatly indebted.

dark-mode-toggle.js creates and adds a click handler for a dark mode toggle button. This toggle button lives in the toolbar at the top of the left-hand sidebar:

And when dark mode is active:

dark-mode.css contains the styles which - y'know, make everything dark, like so:

If you want to "install" this dark mode, here's all you need to do:

1. Be an administrator of your Rocket.Chat instance, or send these instructions to one and pester them to do it for you
2. Go to the Administration panel > Layout
3. Copy the contents of dark-mode.css into Custom CSS
4. Copy the contents of dark-mode-toggle.js into Custom Scripts > Custom Script for Logged In Users
5. Refresh your local Rocket.Chat instance (a server restart is not required). You may need to clear your cache if using a web browser.

If you encounter any problems with this dark mode plugin, please open an issue - or better yet, fix it and open a pull request. If you're a JavaScript or CSS wizard (I'm not), feel free to add features and styles or improve code quality. It's always appreciated.