refactor: Switch to pipenv

CONTRIBUTING.md

@@ -1,18 +1,18 @@
 # Contributing to API Elements Documentation
 
 The documentation is built using Sphinx, a Python tool. Assuming you have
-Python 3 installed, the following steps can be used to build the site.
+Python 3 and
+[pipenv](https://pipenv.readthedocs.io/en/latest/install/#installing-pipenv)
+installed, the following steps can be used to build the site.
 
 ```shell
-$ python3 -m venv venv
-$ source venv/bin/activate
-$ pip install -r requirements.txt
+$ pipenv install
 ```
 
 ## Running the Development Server
 
 You can run a local development server to preview changes using the following:
 
 ```shell
-$ make watch
+$ pipenv run make watch
 ```

Pipfile

@@ -0,0 +1,17 @@
+[[source]]
+name = "pypi"
+url = "https://pypi.org/simple"
+verify_ssl = true
+
+[dev-packages]
+sphinx = "*"
+recommonmark = "*"
+sphinx-rtd-theme = "*"
+pygments-apiblueprint = "*"
+pygments = "*"
+sphinx-autobuild = "*"
+
+[packages]
+
+[requires]
+python_version = "3.7"

requirements.txt

@@ -1,28 +1,34 @@
-alabaster==0.7.10
+-i https://pypi.org/simple
+alabaster==0.7.12
 argh==0.26.2
-Babel==2.5.3
-certifi==2017.11.5
+babel==2.6.0
+certifi==2018.11.29
 chardet==3.0.4
-CommonMark==0.5.4
+commonmark==0.8.1
 docutils==0.14
-idna==2.6
-imagesize==0.7.1
-Jinja2==2.10
-livereload==2.5.1
-MarkupSafe==1.0
+future==0.17.1
+idna==2.8
+imagesize==1.1.0
+jinja2==2.10
+livereload==2.6.0
+markupsafe==1.1.0
+packaging==19.0
 pathtools==0.1.2
 port-for==0.3.1
-Pygments==2.2.0
-pytz==2017.3
-PyYAML==3.12
-recommonmark==0.4.0
-requests==2.18.4
-six==1.11.0
+pygments-apiblueprint==0.1.0
+pygments-markdown-lexer==0.1.0.dev39
+pygments==2.3.1
+pyparsing==2.3.1
+pytz==2018.9
+pyyaml==4.2b4
+recommonmark==0.5.0
+requests==2.21.0
+six==1.12.0
 snowballstemmer==1.2.1
-Sphinx==1.6.6
 sphinx-autobuild==0.7.1
-sphinx-rtd-theme==0.3.1
-sphinxcontrib-websupport==1.0.1
-tornado==4.5.3
-urllib3==1.22
-watchdog==0.8.3
+sphinx-rtd-theme==0.4.2
+sphinx==1.8.3
+sphinxcontrib-websupport==1.1.0
+tornado==6.0a1
+urllib3==1.24.1
+watchdog==0.9.0