Relatively quick fix to update homebrew install #129
Merged
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Previous instructions used a ruby command to install: brew now installs with bash.
Removes some old images. I replaced then with code blocks to show what's in the terminal.
The contents/mac/install_homebrew_troubleshooting.tw2 page had no useful information so I removed it.
Importantly, I replace the gitter.im link with a link to the forum.