[Container] 2.x Documentation improvements & advertising

[Nevakanezah]

Improve plugin documentation in all its forms, as many elements of the plugin remain largely unintuitive to players. These improvements also encompass the plugin's brand and advertising strategy.

Core updates include:

• Create an improved plugin overview video
• Create wiki pages outlining the function of each module
• Improve in-game feedback for activities like horse registration
• Posts & updates to the spigot page, reddit, and other social media

[Nevakanezah]

Pushed to 2.x