This pr removes some useless code and removes the --production on npm install, as discord often uses -dev packages and removes confusion.
Makes it generally more simple for people to run bots without having to figure out to remove the --production (not needed for bots)
### All Submissions:
* [Y] Have you followed the guidelines in our Contributing document?
* [Y] Have you checked to ensure there aren't other open [Pull Requests](../../pulls) for the same update/change?
* [Y] Did you branch your changes and PR from that branch and not from your master branch?
* If not, why?:
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### Changes to an existing Egg:
1. [Y] Have you added an explanation of what your changes do and why you'd like us to include them?
Adds support for private repos and changes some wording. For example, it fixes a typo and changes some instances of "git" to "GitHub" to help out people with limited experience. It also fixes an inconsistency with the discord.py egg where users could not edit the values for the discord.js egg but could on the discord.py egg. If this was intentional, feel free to undo those changes.
2. [~] Have you tested your Egg changes?
It'd be helpful if someone could try this with a public repository since I was unable to find a discord.js bot in a public repo and my bot has a lot of confidential info hardcoded into it. It works fine with private repos and there seems to be no reason why it wouldn't work with public repos since I didn't change anything with respect to those.
