Add link to projsync

[oleg-alexandrov]

The page https://proj.org/resource_files.html mentions projsync but doesn't link to it. This pull requests addresses that.

[kbevers]

The proposed fix changes the formatting from the black bold text of the program-directive to blue, regular font of clickable links. That's probably not a big deal in and of itself but it's inconsistent to just about all other references to the PROJ CLI apps used in the docs. I'm not sure this is the best fix to the problem, as this just scratces a particular itch of yours instead of introducing a general improvement across all of the documentation that keeps the look and feel of the docs consistent.

I agree that it would be much better to have the program-directive link to the actual doc-page for that application but that is not possible and is a well-known limitation of Sphinx. A better solution might land in Sphinx at some point cf sphinx-doc/sphinx#880.

[hobu]

That's probably not a big deal in and of itself but it's inconsistent to just about all other references to the PROJ CLI apps used in the docs.

Why shouldn't all of the links to the PROJ CLI apps be clickable links?

[oleg-alexandrov]

this just scratces a particular itch of yours

I don't appreciate being second-guessed in my intentions.

The proposed change offers a link to a relevant tool. I would think that is more important than look-and-feel. But that is for you folks to figure out.

[snowman2]

I really like links when navigating documentation and always appreciate it when they exist as it makes for a better experience, for me at least.

Thoughts about updating this PR with a general search and replace to change projsync references to links for consistency sake?

[rouault]

cf #3534 for an attempt at a generic solution for linkable program directive

[kbevers]

Why shouldn't all of the links to the PROJ CLI apps be clickable links?

That'd be lovely, which is why I was asking for a general solution in favour of the local fix. Seems @rouault how found a way to make that way.

[rouault]

superseded per #3534