[develop]: Add testing chapter to UG (#884)

* add/update requirements files

* add xlinks to build/run files

* update gitignore to NOT ignore BuildingRunningTesting dir

* update configuration

* update links

* add linkcheck to Makefile

* add preliminary testing chapter

* rename docs to doc

* update RTD yaml paths from docs to doc

* minor updates to testing ch

* minor updates to testing ch

* add test summary statement

Author: gspetro-NOAA

.gitignore

@@ -9,7 +9,7 @@
 # USE CAUTION WHEN ADDING WILDCARDS, as some builds use different filename   #
 # conventions than others                                                    #
 ##############################################################################
-build*/
+build/*/
 install*/
 
 *.[aox]

.readthedocs.yml

@@ -11,7 +11,7 @@ build:
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
-  configuration: docs/UserGuide/conf.py
+  configuration: doc/UserGuide/conf.py
 
 # Build documentation with MkDocs
 #mkdocs:
@@ -22,6 +22,5 @@ formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-#  version: 3.7
   install:
-    - requirements: docs/UserGuide/requirements.txt
+    - requirements: doc/UserGuide/requirements.txt