Update folder structure based on style guide

[artlowel]

References

• Fixes Update folder structure based on latest Style Guide #327
• Replaces rename +dir to dir #527

Description

This PR removes the + from all folder names. It was used to indicate lazily loaded modules, but since that's the default now it is no longer recommended in the style guide.

Instructions for Reviewers

The biggest thing to verify is that I haven't accidentally removed a + where I shouldn't have, e.g. in a string that doesn't refer to a path.

Checklist

• My PR is small in size (e.g. less than 1,000 lines of code, not including comments & specs/tests), or I have provided reasons as to why that's not possible.
• My PR passes TSLint validation using yarn run lint
• My PR doesn't introduce circular dependencies
• My PR includes TypeDoc comments for all new (or modified) public methods and classes. It also includes TypeDoc for large or complex private methods.
• My PR passes all specs/tests and includes new/updated specs or tests based on the Code Testing Guide.
• If my PR includes new, third-party dependencies (in package.json), I've made sure their licenses align with the DSpace BSD License based on the Licensing of Contributions documentation.

[tdonohue]

👍 Looks great now, @artlowel ! Thanks again. I've run this locally and done a quick test of most pages of the site (login/logout, clicked around in admin tools, edited every type of object, completed submissin, etc). As we'd expect, everything appears to be working. As soon as GitHub CI finishes it's tests/approval, I'll get this merged.