Revised non-copypasta help section, added one to copypasta.

* There were two help sections in non-copypasta. Merged them into one.
* Clarified options as separate bullet points, added email option.
* Added help section to copypasta.
* Added pointers from relevant points to newly created help section in copypasta.
* If the help section in copypasta is deemed sufficient, I can remove the mostly identical section in non-copypasta.
* Final OP counts: 3851 characters, 33 links
Moved "How can I help?" section. Rephrased "Want to contribute" section.
Discussed changes implemented.

* Removed "Make an account on GitHub" from in front of three lines. Added "(GitHub account needed.)" at the end of two of those lines. Seems less repetitive, because it's not an instruction, it's a prerequisite.
* Changed "tips" to "updates/changes/issues".
* Changed all mentions of "GamerGateOP" to "GitHub repository".
* Put pronounced emal address in quotes for clarification.
* Streamlined 4chan notes in non-copypasta section.
* Cut out non-copypasta clone of contribution instructions completely.
Merge pull request #72 from GamerGate/patch-2

Revised non-copypasta help section, added one to copypasta.