Updates to the "Writing your first patch for Django" Documentation Page

[Nina Zakharenko]

While this section is helpful, it should be updated to reflect a git-oriented and not patch-based workflow. Once these changes are made, it can also be featured as a 'Quick Start' to contributing section, and featured in the 'First Steps' portion of the contribution guide.

The following workflow should be represented in the document:

1. Fork the project, Then Clone your fork
2. Running Tests (Link To ​https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/unit-tests/)
3. Create a Branch
4. Modify the Code / Documentation
5. Diff your changes with Upstream
6. Commit - (Link to Coding Style / Commit Guidelines Here)
7. Push to your branch
8. Create a Pull Request

Links to more detailed documentation for the steps above should be provided where needed.

Additionally, the following needs to be done:

• Prominently Link to the Git Workflow, near the top. (​https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/working-with-git/)
• Change the title to 'Quick Start Guide to Contributing'
• Remove all References to 'Patch', including in links to this document from other places
• Rewrite the 'So What do I do next Section?'
• Remove the 'Since we never committed our changes locally' section, since in the new workflow we *did* commit our changes locally.
• Add a link to the document under the 'First Steps' section of the Contribution Guide