Merge pull request #4418 from jjimenezshaw/doc-all-images

[doc] Add 'List of all projection images' page to documentation

Author: rouault

docs/docbuild/README.md

@@ -6,3 +6,9 @@ From the base PROJ repository directory:
 cd docs
 docker run -i -t -v $PWD/..:/io -w /io/docs/ ghcr.io/osgeo/proj-docs make html
 ```
+
+When a projection image is added or deleted run
+
+```bash
+python3 docs/source/operations/projections/generate_all_images.py
+```

docs/plot/plotdefs.json

@@ -556,6 +556,18 @@
         "res": "low",
         "type": "poly"
     },
+    {
+        "filename": "healpix.png",
+        "latmax": 90,
+        "latmin": -90,
+        "lonmax": 180,
+        "lonmin": -180,
+        "name": "healpix",
+        "projstring": "+proj=healpix",
+        "res": "low",
+        "type": "line",
+        "delta_cut": 1e6
+    },
     {
         "filename": "igh.png",
         "latmax": 90,
@@ -1278,6 +1290,18 @@
         "res": "low",
         "type": "poly"
     },
+    {
+        "filename": "rhealpix.png",
+        "latmax": 90,
+        "latmin": -90,
+        "lonmax": 180,
+        "lonmin": -180,
+        "name": "rhealpix",
+        "projstring": "+proj=rhealpix",
+        "res": "low",
+        "type": "line",
+        "delta_cut": 1e6
+    },
     {
         "filename": "robin.png",
         "latmax": 90,