This is a few changes to the docs I made after activating RTD for astroscrappy (see #4). @cmccully, are you ok with the various content changes here? I didn't really change anything, just moved stuff around.
Coverage remained the same at 100.0% when pulling 431a5276527c16014c3eba9dd6f220c9ff7f5811 on eteq:docs-update into 3ed58dd537e40efed983ca049602af6e3e9f5ce7 on astropy:master.
This seems uncontroversial and definitely cleans some stuff up, so I'm going to merge. But @cmccully, if you disagree with something here feel free to say so and we can revert/change it in a separate PR!
This is a few changes to the docs I made after activating RTD for astroscrappy (see #4). @cmccully, are you ok with the various content changes here? I didn't really change anything, just moved stuff around.