remove docs, move docs to universal repo

https://github.com/HttpRunner/docs

.travis.yml

@@ -7,8 +7,8 @@ python:
 matrix:
   include:
     - python: 3.7
-      dist: xenial
-      sudo: true
+      dist: xenial  # Required for Python 3.7
+      sudo: true    # Required for Python 3.7
 install:
   - pip install poetry
   - poetry install -vvv