Major docs revamp

This MR restructures the docs and revamps the content, providing a lot more detail on things like auth and the command-line interface.

Closes #23 (closed)
Closes #21 (closed)

.gitlab/ci/docs.yml

@@ -17,9 +17,11 @@ include:
 docs:
   stage: Documentation
   needs: []
-  extends:
-    # https://computing.docs.ligo.org/gitlab-ci-templates/python/#.python:sphinx
-    - .python:sphinx
+  # https://computing.docs.ligo.org/gitlab-ci-templates/python/#.python:sphinx
+  extends: .python:sphinx
+  variables:
+    BUILDER: "html"
+    SPHINXOPTS: "-E -W"
   before_script:
     - python -m pip install .[docs]