Updates to hero graphic guidelines

[nataliafitzgerald]

Short description explaining the high-level reason for the pull request

Additions

• Update documentation of min and max character counts for hero graphics #460
• Add full bleed illustration option to hero graphic guidelines #462
• Add photo option to hero graphic guidelines #464
• Update in-page navigation to align with other DM pages

Removals

• Remove the button and link options from the hero module #454

Changes

Testing

Review

• @user

Preview this PR without the whitespace changes

Screenshots

Notes

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Todos

-

Checklist

• [ ] Changes are limited to a single goal (no scope creep)
• [ ] Code can be automatically merged (no conflicts)
• [ ] Code follows the standards laid out in the front end playbook
• [ ] Passes all existing automated tests
• [ ] New functions include new tests
• [ ] New functions are documented (with a description, list of inputs, and expected output)
• [ ] Placeholder code is flagged
• [ ] Visually tested in supported browsers and devices
• [ ] Project documentation has been updated (including the "Unreleased" section of the CHANGELOG)

[nataliafitzgerald]

• @sarahsimpson09 and @jordanafyne. I couldn't find you on the "Reviewers" list.

[jenn-franklin]

Looks good! Thanks for your work on this.

[sarahsimpson09]

:+1:

[jordanafyne]

:+1:

[nataliafitzgerald]

@ielerol - I fixed the broken link. Look good to go?