Update cli docs (#663)

docs/reference/cli/index.rst

@@ -4,5 +4,8 @@ CLI
 ============
 
 .. toctree::
+    :maxdepth: 1
 
-    ns_process_data
+    ns_process_data
+    ns_render
+    ns_eval

docs/reference/cli/ns_eval.md

@@ -0,0 +1,9 @@
+# ns-eval
+
+```{eval-rst}
+.. argparse::
+    :module: scripts.eval
+    :func: get_parser_fn
+    :prog: ns-process-data
+    :nodefault:
+```

docs/reference/cli/ns_render.md

@@ -0,0 +1,14 @@
+# ns-render
+
+:::{admonition} Note
+:class: warning
+Make sure to have [FFmpeg](https://ffmpeg.org/download.html) installed.
+:::
+
+```{eval-rst}
+.. argparse::
+    :module: scripts.render
+    :func: get_parser_fn
+    :prog: ns-process-data
+    :nodefault:
+```