Docs: Fix Rivet icons/stickers release version

[basham]

The docs list outdated versions:

• Rivet Icons is rivet-icons@3.0.0 but should be rivet-icons@3.0.1
• Rivet Stickers is rivet-stickers@0.3.1 but should be rivet-stickers@0.3.1

Should we just leave off the version numbers on these pages so they don't get out of date for minor and patch releases, so it is always the latest?

• https://unpkg.com/rivet-icons/dist/rivet-icons.js
• https://unpkg.com/rivet-stickers/dist/rivet-stickers.js

Or perhaps we just leave the major number so that it automatically completes to the latest version of that major?

• https://unpkg.com/rivet-icons@3/dist/rivet-icons.js
• https://unpkg.com/rivet-stickers@0/dist/rivet-stickers.js