Add "Read more" button to readmes 3️⃣

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Note: This is part 3 of a few merge requests targeting profile-layout-reorganization. We're splitting into several in the hopes that it'll be easier to review 🤞

The final set of changes will look something like Update profile page layout (!134569 - closed)

• Part 1: Reorganize profile page layout 1️⃣ (!136910 - merged) • Annabel Dunstone Gray, Sascha Eggenberger • 16.7
• Part 2: Fix calendar alignment and add achievements sec... (!136938 - merged) • Annabel Dunstone Gray, Sascha Eggenberger • 16.7

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What does this MR do and why?

• Adds Read more button at bottom of longer readmes
• Moves personal projects to bottom (this will be addressed further in separate MRs)
• Fixes user action button size

Screenshots or screen recordings

Before	After

How to set up and validate locally

✂️ UX Paper Cuts 16.6 → Activity (#425468 - closed)