chore(pages): revise free.law CourtListener images

[cweider]

Bring revised workmark from freelawproject/courtlistener#2912 to its usages on free.law:

• Home page
• Project navigation menu
• CourtListener project page
• OpenGraph image

Also here:

• Create a bolder initials only image for small sizes.
• Drop use of RightImage since it was hindering sizing.

Before	After

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[mlissner]

Very nice, but be warned if you're planning more or similar, we're on the brink of a big rebrand, which will bring lots of changes, I think.

[cweider]

Great – no further changes planned.