[V3 Docs] Modify RTD config to (hopefully) make it build (#1644)

* Fix docs requirements

* Modify RTD config

.readthedocs.yml

@@ -10,5 +10,4 @@ python:
   version: 3.6
   pip_install: true
   extra_requirements:
-    - docs
     - mongo

docs/Makefile

@@ -14,6 +14,9 @@ help:
 
 .PHONY: help Makefile
 
+init:
+	cd .. && pipenv lock -r --dev > docs/requirements.txt
+
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile

docs/requirements.txt

@@ -1,4 +1,28 @@
-sphinx>=1.7
-sphinxcontrib-asyncio
-sphinx_rtd_theme
-git+https://github.com/Rapptz/discord.py@rewrite#egg=discord.py[voice]
+-i https://pypi.org/simple
+alabaster==0.7.10
+attrs==18.1.0
+babel==2.5.3
+certifi==2018.4.16
+chardet==3.0.4
+docutils==0.14
+idna==2.6
+imagesize==1.0.0
+jinja2==2.10
+markupsafe==1.0
+more-itertools==4.1.0
+packaging==17.1
+pluggy==0.6.0
+py==1.5.3
+pygments==2.2.0
+pyparsing==2.2.0
+pytest-asyncio==0.8.0
+pytest==3.5.1
+pytz==2018.4
+requests==2.18.4
+six==1.11.0
+snowballstemmer==1.2.1
+sphinx-rtd-theme==0.3.1
+sphinx==1.7.4
+sphinxcontrib-asyncio==0.2.0
+sphinxcontrib-websupport==1.0.1
+urllib3==1.22