Add citation information to about dialog with link to paper

[bellerbrock]

Description

Provide a summary of your changes including motivation and context. If these changes fix a bug or resolves a feature request, be sure to link to that issue.

closes #571

Type of change

What type of changes does your code introduce? Put an x in boxes that apply.

• [ ] CHANGE (fix or feature that would cause existing functionality to not work as expected)
• [ ] FEATURE (non-breaking change which adds functionality)
• [ ] BUGFIX (non-breaking change which fixes an issue)
• [x] ENHANCEMENT (non-breaking change which improves existing functionality)
• [ ] NONE (if none of the other choices apply. Example, tooling, build system, CI, docs, etc.)

Checklist:

• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have updated relevant documentation

Changelog entry

Please add a one-line changelog entry below. This will be copied to the changelog file during the release process.

citation information added to about dialog with link to paper

[trife]

• [x] Dialog title to Citation
• [x] Stylize the actual citation as fixed width font
• [x] Move citation link to main section (above rate)
• [x] Use this icon in the about page
• [x] Title the about entry "Cite Field Book"
• [x] Rename the rate entry to "Rate Field Book"