Single Page HTML Manual is encoded in ISO-8859-1

[chrism]

This is OK when opening as a file in a browser, although it in theory it restricts the characters that could be used, but a problem if accessing from a web server that is configured to mark all content as UTF-8.

It's a limitation of the DocBook XSL, switching to HTML5 resolves this and avoids the legacy HTML.

Suggested implementation: ​https://github.com/postgis/postgis/pull/743

[strk]

I've pushed an html5 branch to see if bots are happy with it

[Sandro Santilli <strk@…>]

In 40502f8/git:

Publish the manual in HTML5

This enables the single page manual to be encoded in UTF-8 instead of
ISO-8859-1, and allows browsers to process the pages without resorting
to quirks mode.

Closes #5553

[strk]

This change resulted in Debbie's built documentation being corrupted, see #5559

[strk]

We need to use a stylesheet customization layer to do utf8, see ​http://www.sagehill.net/docbookxsl/OutputEncoding.html

I'm reopening this ticket as I plan to revert the commit closing it

[robe]

The single page ones seem to be fine I think, but date reads Friday which seems wrong since I regenerated.

​https://postgis.net/docs/manual-3.5/postgis-en.html

The hash looks right c65bbfb that is the last commit in master

[strk]

I guess we can re-close this until otherwise proved this was the cause of failure. Locally I don't see a problem with rendering the xhtml generated after this change.

Let's continue the discussion in #5559