Text/description edits

[absempere]

1. When you build a project and first go to import the events file, the text/description on the import page mentions annotations instead of events, which of course was very confusing. Maybe we could review all the text together? I know we haven't done that yet and a bunch of the below is based on terminology. 

2. These lines are on the "Add project" page are really confusing. Can we discuss what's happening so that we can edit these lines so they're a little more clear? 
   Private repositories do not generate GitHub Pages sites. Instead they will generate a static site and check it into your project repository.
   and
   Generate a GitHub Pages site. If unchecked a static site which you can deploy will be created and checked into your project repository.

3. On the add project page where it says Additional users, can we say "Additional GitHub users"?  

4. On Events import, the AVFile label seems to be the field that is not automatically detected and continues to say "ignore this field"  

5. Unlike the add project page and the add event page, the Tags import page has no descriptive information about the difference between "import file" and "Add Tag Group." Also, there is different nomenclature for groups and categories for tags. In tags editing it says "Create group" but on the upload they are called "categories" and then they are called "tag groups" on the index page. Should we just use "groups" throughout?