add details to setup page for git install and config

[evanwill]

added updated details about installing git and configuring locally.
the original instructions were based on SWC, where there is centralized set up instructions provided in the "workshop template". Library Carpentry lessons seem more stand alone, so we can't be sure that participants have done a centralized set up, so I hope this ensures clarity for everything needed for the Git lesson.

it suggests everyone use Nano editor as default, since it is installed by default in MacOS and Linux, and is bundled with Git for Windows, and seems easiest to explain when it pops up during a merge.

[katrinleinweber]

OK, thanks! I suggest we wait with reviewing this until we have #41 merged. There is also #7 seems to partially overlap with this PR.

[katrinleinweber]

I merged #41 now, because it fixed an actually out-dated piece of info.

With #7, we basically have two competing PRs about the same topic here. I wonder whether we should forgo refining our own version of the setup and instead refer directly to SwCarpentry.GitHub.io/git-novice/02-setup?

[katrinleinweber]

@evanwill: Because you started this PR from your gh-pages branch, I was warned by GitHub when I wanted to resolve the conflict just now. Please resolve the conflict and in the future always add commits to a branch other than master or gh-pages. Thank you!

[libcce]

SwCarpentry.GitHub.io/git-novice/02-setup

This makes better sense to me.

[evanwill]

@libcce and @katrinleinweber the lesson needs instructions to 1. install Git and 2. Configure Git.
I think the SWC approach of having the configuration step as part of the lesson (the Setting up git page you referred to), so it can be part of the learning process, makes the most sense--I fleshed it out here because the current LC-git lesson doesn't have configuration anywhere else.

i think i will just close this and open an issue for discussion

[katrinleinweber]

I'm fine with discussing it here. Please feel free to add a commit that implements a reference to SwCarpentry.GitHub.io/git-novice/02-setup and I'll re-open this.

[katrinleinweber]

@libcce: If we are still in agreement about #42 (comment), we can close #7.

[libcce]

@katrinleinweber We can at least close #7. I agree.

[katrinleinweber]

@dheles: What do you think?