Remove unused projects.utils.github_paginate

It's broken, not used in the project and superseded by
oauth.utils.github_paginate.

Author: gregmuellegger

readthedocs/projects/utils.py

@@ -182,21 +182,3 @@ def make_api_project(project_data):
     project = Project(**project_data)
     project.save = _new_save
     return project
-
-
-def github_paginate(client, url):
-    """
-    Scans trough all github paginates results and returns the concatenated
-    list of results.
-
-    :param client: requests client instance
-    :param url: start url to get the data from.
-
-    See https://developer.github.com/v3/#pagination
-    """
-    result = []
-    while url:
-        r = session.get(url)
-        result.extend(r.json())
-        url = r.links.get('next')
-    return result