docs: Add feature build to publish script

Signed-off-by: John DeNisco <jdenisco@cisco.com>
Change-Id: I6a938f426b9a8e1242fa5c6f9716a3f9db4d4976

docs/etc/requirements.txt

@@ -1,4 +1,5 @@
 alabaster==0.7.12
+attrs==19.3.0
 Babel==2.8.0
 certifi==2019.11.28
 chardet==3.0.4
@@ -6,12 +7,17 @@ commonmark==0.9.1
 docutils==0.16
 idna==2.8
 imagesize==1.2.0
+importlib-metadata==1.5.0
 Jinja2==2.10.3
+jsonschema==3.2.0
 MarkupSafe==1.1.1
 packaging==20.0
+pyaml==20.3.1
 Pygments==2.5.2
 pyparsing==2.4.6
+pyrsistent==0.15.7
 pytz==2019.3
+PyYAML==5.3
 recommonmark==0.6.0
 requests==2.22.0
 six==1.14.0
@@ -25,3 +31,4 @@ sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.2
 sphinxcontrib-serializinghtml==1.1.3
 urllib3==1.25.8
+zipp==3.1.0