ReSpec HTML generation needs to use correct revision of MAINTAINERS.md

[handrews]

As seen in PR #3688, scripts/md2html fails to use the correct revision of the MAINTAINERS.md file for the 3.0 and 3.1 specifications. Specifically, build.sh uses a specific revision for the 2.0 spec, but not for the later specs. Also, the collection of emeritus members in md2html.js seems to no longer work with the current file format.

[lornajane]

Would it make sense to version the maintainer files?

[ralfhandl]

The build script expects "Emeritus" to be the second unordered list:

OpenAPI-Specification/scripts/md2html/md2html.js

Lines 121 to 125 in 64111cc

	u = $('ul').eq(1);
	$(u).children('li').each(function(e){
	let t = $(this).text().split('@')[0];
	emeritus.push({name:t});
	});

Now the second list is "Provisional".

Should provisional maintainers be

1. ignored, or
2. treated identical to "Active"?

[ralfhandl]

Special case for version 2.0 is incorrect as the history of Maintainers.md starts too late, and the first commit already lists two members as "Emeritus" who were still active when version 2.0 was published.