Refactor from More Features to Embeds, Events, Markdown

[Elitesparkle]

trafficstars

Split the More Features page into 3 separate pages: Embeds, Events, Markdown. Furthermore, add Related Topics to connect the Embeds page and the Markdown page to each other.

[BobDotCom]

I added a couple markdown examples, and moved the element style pages into their own category.

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[Elitesparkle]

~~There are 3 warnings about quote blocks inside Discord examples. I'm not sure if they need to be changed and how.~~

Fixed. No more warnings but the examples are showing wrong.