attempt to turn on exhale for readthedocs. It's -really- slow.

.gitignore

@@ -4,3 +4,5 @@
 /examples/*/output/
 /out/
 /docs/generated
+/docs/doxyoutput
+/docs/api

docs/conf.py

@@ -30,8 +30,8 @@ author = 'Keyboardio & Friends'
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-   # 'breathe',
+    'breathe',
-   # 'exhale',
+    'exhale',
     'recommonmark'
 
 ]
@@ -59,7 +59,7 @@ exhale_args = {
     "createTreeView":        False,
     # TIP: if using the sphinx-bootstrap-theme, you need
     # "treeViewIsBootstrap": True,
-    "exhaleExecutesDoxygen": False,
+    "exhaleExecutesDoxygen": True,
     "exhaleDoxygenStdin":    "INPUT = ../src",
     "verboseBuild": True
 }

docs/requirements.txt

@@ -1 +1,3 @@
+sphinx>=2.0
+breathe>=4.13.0
 exhale