Codeblock and inline code styling differs between web and iOS

[Skalakid]

Objective

The objective of this task is to align web markdown styling with iOS, since code and codeblock styles are different.

Current state

[robertKozik]

Web implementation looks aligned with android behaviour - in terms of background span

[Skalakid]

I think the expected styling in os iOS, so we should align both Android and Web to it

[tomekzaw]

Should be fixed with #306 and #456