Clarify contribution process

[p3r7]

This is an attempt at clarifying the chronology of the contribution process.

• make it explicit that authors should host their scripts on a public git repo
• now that we have ;install <git_url>, I feel like creating a lines thread could occur before declaring it on the maiden community repo
• more explicit explanation of the role of a script inline header documentation
• mention about the wiki and that it can be linked to in the maiden community repo entry

I initially tried to keep the contribute & gather section separated, but had a hard time given how interleaved they were. It's certainly due to the "chicken & egg problem" between publishing a script and communicating about it on lines + the wiki (w/ all the X-referencing).

I kinda feel that this whole process might be worth having it's own how-to documentation page separated from this maiden page (with maybe a small flowchart showing which steps are optional) but didn't want to make too many changes at once.

[p3r7]

Addressed all the comments above.

[ngwese]

awesome, thanks! i’ll leave the final call to @dndrks as the primary author for much of the docs.

[p3r7]

Thanks for the prompt feedback.

Applied all the fixes + suggestions.