* Markdown: make '>Quote' look less like a banner
Quotes should be subtle as it is primarily intended for redundant content, but currently it looks more like a banner that brings lots of focus.
This change is also background-independent. Currently, the Quotes in Posts doesn't look like it has a background color, because it happened to be the same as the Post's background. This makes it inconsistent with Quotes in Comments. Let's just always make it blend in + grayish text.
* Markdown: inline code tweak
- better symmetry
- less spacing to the left and right, since it's common to already have a space in the sentence (even if it doesn't, like in CJK, the new spacing looks sufficient).
* 4481: Use regular font in Markdown Editor
I think we should not use Monospace fonts for the Markdown Editor since we are not coding.
Similar to Github, code-blocks and inline-code only gets converted to monospace in the Preview.