Improve indentation config msg #62
                
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Currently when a new user tries indenting, that basically invokes help for the
mode hook, which isn't useful and looks more like a bug than anything else.
Solve this by printing an explicit explanation that a user needs to enable an
indentation mode.
While at it, also remove "Support" and "Contributing" sections from the README, because they contain no useful information. The former is just a link to here (which is pointless, because if a user reads it they already here), and the latter just has no useful info.