Overview of the branches

Description

Provide overview of the branches on a project to navigate users to active/stale/all branches (cf. #17293 (closed))

Proposal

/[namespace]/[project]/branches must be a good navigator for the status of the branches.

Links / references

#17293 (closed)

Documentation blurb

Overview

Branches pages of gitlab-org/gitlab-ce have 200 pages as of Nov 2017, which is hard for developers to manage branches.

Use cases

Project master users will maintain the branches with their activity to keep the project's velocity/productivity.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.

/label ~"feature proposal"