Table for different map projections

[willschlitzer]

The current projection gallery displays the different types of projections by name and a sample image. I propose that the home page for the projections also include a table listing the different projection "codes" (R, G, X, M etc.) and the associated projection name. This will allow someone to quickly identify the projection specified if they are referencing a PyGMT script but unfamiliar with the available projections (as happened to me after seeing the usage of projection="R-130/5i" in Liam's YouTube tutorial).

Are you willing to help implement and maintain this feature? Yes

I'm happy to do this, but am unfamiliar with how to add a table using Sphinx.

[seisman]

GMT provides a table for projections (https://docs.generic-mapping-tools.org/latest/proj-codes.html), and the code is available from https://github.com/GenericMappingTools/gmt/edit/master/doc/rst/source/proj-codes.rst.

The table shows both GMT and PROJ projections codes, but perhaps we only want the GMT ones to keep it simple? Also related to #356.

[seisman]

Closed by #753.