The modal gets a bit of love

Not gonna lie, I'm surprised I didn't catch that URL bug on the local image modal, soooo don't mind that

Added

Add a setting to pick a folder to exclusively search banners in, using the local image modal (#10)
Add a toggle to show or hide preview images in the local image modal

Fix local image paths being mistaken as URLs, therefore not loading them properly (#9)
Fix potential slowdown of too many images loading in the local image modal, by limiting how many can be displayed at once (#10)
- This is also a new setting you can alter. Its default is 10
Somewhat related, but the Yin and Yang theme is now compatible with this plugin! (#3, chetachiezikeuzor/Yin-and-Yang-Theme#54)
- It's a very nice theme too, so it's neat to mix banners with them now~

Spruced up the settings a tad, both visually and logically
Made a nice lil' GitHub action for releases
- none of you will actually care about that, but I just find it neat