[PROJ] proj manual, versioning, download location

[Even Rouault]

Mike,

> https://proj-tmp.readthedocs.io/en/latest/

Looks great! (I was actually thinking today of using Travis or some other CI 
doing checkouts of several branches, building the docs and copy them at 
appropriate subdirectories)

Just a few observations:

The html target of docs/Makefile has a final step doing

@cp -r ../schemas $(BUILDDIR)/html/schemas

so as to have
https://proj.org/schemas/v0.1/projjson.schema.json
https://proj.org/schemas/v0.2/projjson.schema.json

I don't see files at:

https://proj-tmp.readthedocs.io/en/latest/schemas/v0.1/projjson.schema.json
or
https://proj-tmp.readthedocs.io/schemas/v0.1/projjson.schema.json

And similarly for the nasty hack just above in the Makefile removing the
namespace occurences you can see in
https://proj-tmp.readthedocs.io/en/latest/development/reference/cpp/
cpp_general.html
but not in
https://proj.org/development/reference/cpp/cpp_general.html

Are those post-Sphinx customization/hack steps doable ?

Even

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