Clean up HTML with comments and blank lines

clean-html.md

Clean up HTML with twig template suggestion comments, etc.

In Atom anyway, with Regex enabled, find/replace:

1. Get rid of comments with:

Find: (?=<!--)([\s\S]*?)-->
Replace: ""

2. Clean up blank lines with:

Find: \n+
Replace: \n

NB: Blank lines replace presumes "Remove trailing spaces" is enabled. Otherwise, try:

Find: ^(?:[\t ]*(?:\r?\n|\r))+,
Replace: ""

Of course: https://stackoverflow.com/a/1732454/3189029