RSI Reading Mode per CitizenSpaceDE

We love to dive deep into the lore of Star Citizen, unfortunately the design choices CIG made on their platform aren't doing their posts a favour in terms of readability.

This extension gets rid of the fluff and makes the legacy long-form posts (like Whitley's Guide and the serialized fiction posts) on the RSI-website more readable. It does that by changing the font size, color and line-height. Additionally it removes some of the background patterns.