Updates to Headers and Font Replacement

[fthobe]

Summary

Add previously discussed I have:

• realigned the discussed span conversion with the general style
• as discussed with nebulab replaced the font
• all other changes as previously discussed in #377
• removal of .woff fonts as they are now universally supported to reduce foot print #379
• removal of references to Bradford Book and removal of the font itself as 450 weight serif was not used in any view
• replacement of fonts as discussed with @kennyadsl

Checklist

Check out our PR guidelines for more details.

The following are mandatory for all PRs:

• [X] I have written a thorough PR description.
• [X] I have kept my commits small and atomic.
• [X] I have used clear, explanatory commit messages.

The following are not always needed:

• 📖 I have updated the README to account for my changes.
• 📑 I have documented new code with YARD.
• 🛣️ I have opened a PR to update the guides.
• ✅ I have added automated tests to cover my changes.
• 📸 I have attached screenshots to demo visual changes.

[jarednorman]

I'm closing this PR, and not because the changes in it aren't necessarily valid.

We expect individual changes to iterated on within a single PR using git rebase. Making me hunt back through multiple PRs to find multiple pieces of feedback that explain the different changes in this PR is both unnecessary and annoying. Please make the changes to the original PRs and reopen them.

We like small, focused, well-explained PRs, not combinations of multiple PRs.

"Bugfix to _fonts.scss after font replacement" is not an acceptable commit description. Explain what you are doing and why.

Do not include merge commits in your PRs unless absolutely necessary.

I want to be clear that I honestly appreciate the enthusiasm your are showing towards Solidus. I appreciate the work you are doing and want to make the most of it. That said, we manage this project very carefully because many businesses depend on it and derive a ton of value from it. The best way to contributions merged into Solidus is to follow the lead of previous contributors and make your PRs as easy for us to review and understand as you can.