Change HTML indent size to 4

Ghost Userrequested to merge
tc/indent-size-html into master

Short description

Change HTML indent size to 4

Why?

I noticed that most of our HTML files are indented using 4 spaces. This probably means that we have a preference for this indentation style, so I think it's better to make it official and keep it.

Still means that other HTML files need re-indentation.

Edited by Ghost User

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