Readthedocs Build Update (#46)

This commit fixes various build issues with the autodocs. One change was also made to setup.py based on a readthedocs [recommendation](https://docs.readthedocs.io/en/latest/faq.html#i-get-import-errors-on-libraries-that-depend-on-c-modules)

Author: will-rice

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "spokestack/extensions/webrtc/filter_audio"]
-	path = spokestack/extensions/webrtc/filter_audio
-	url = git@github.com:irungentoo/filter_audio.git
+path = spokestack/extensions/webrtc/filter_audio
+url = https://github.com/irungentoo/filter_audio.git

.readthedocs.yml

@@ -5,19 +5,24 @@
 # Required
 version: 2
 
+submodules:
+    include: all
+    recursive: True
 # Build documentation in the docs/ directory with Sphinx
 sphinx:
     configuration: docs/source/conf.py
 
 formats:
-    - html
+    - htmlzip
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
-    version: 3.7
+    version: 3.8
     install:
+        - requirements: docs/requirements.txt
         - method: pip
           path: .
-        - requirements: docs/requirements.txt
+    system_packages: true
+
 build:
     image: latest

docs/requirements.txt

@@ -2,13 +2,14 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile
+#    pip-compile --output-file=./docs/requirements.txt ./docs/requirements.in
 #
 alabaster==0.7.12         # via sphinx
 argh==0.26.2              # via sphinx-autobuild
 babel==2.8.0              # via sphinx
 certifi==2020.6.20        # via requests
 chardet==3.0.4            # via requests
+Cython
 docutils==0.16            # via sphinx
 idna==2.10                # via requests
 imagesize==1.2.0          # via sphinx
@@ -26,20 +27,19 @@ pyyaml==5.3.1             # via sphinx-autobuild
 requests==2.24.0          # via sphinx
 six==1.15.0               # via livereload, packaging, pockets, sphinxcontrib-napoleon
 snowballstemmer==2.0.0    # via sphinx
-sphinx==3.1.2             # via -r requirements.in, sphinx-autodoc-typehints, sphinx-rtd-theme
-sphinx-autobuild==0.7.1   # via -r requirements.in
-sphinx-autodoc-typehints==1.11.0  # via -r requirements.in
-sphinx-rtd-theme==0.5.0   # via -r requirements.in
+sphinx==3.1.2             # via -r ./docs/requirements.in, sphinx-autodoc-typehints, sphinx-rtd-theme
+sphinx-autobuild==0.7.1   # via -r ./docs/requirements.in
+sphinx-autodoc-typehints==1.11.0  # via -r ./docs/requirements.in
+sphinx-rtd-theme==0.5.0   # via -r ./docs/requirements.in
 sphinxcontrib-applehelp==1.0.2  # via sphinx
 sphinxcontrib-devhelp==1.0.2  # via sphinx
 sphinxcontrib-htmlhelp==1.0.3  # via sphinx
 sphinxcontrib-jsmath==1.0.1  # via sphinx
-sphinxcontrib-napoleon==0.7  # via -r requirements.in
+sphinxcontrib-napoleon==0.7  # via -r ./docs/requirements.in
 sphinxcontrib-qthelp==1.0.3  # via sphinx
 sphinxcontrib-serializinghtml==1.1.4  # via sphinx
 tornado==6.0.4            # via livereload, sphinx-autobuild
 urllib3==1.25.10          # via requests
 watchdog==0.10.3          # via sphinx-autobuild
-
 # The following packages are considered to be unsafe in a requirements file:
 # setuptools