hgweb: stop using HTML comments in <script>
Once upon a time, in 1995, there were browsers that didn't understand <script>
tags and they would simply show the code inside as text. This started a
tradition of wrapping everything inside <script> in <!-- HTML comments -->.
Nowadays, it's not only not needed, but can be considered harmful:
- within XHTML documents, the source will actually be hidden from all browsers and rendered useless
- -- is not allowed within HTML comments, so any decrement operations in script are invalid