build(deps): bump bootswatch from `0b64b98` to `c3e6c8b` in /site

[dependabot[bot]]

Bumps bootswatch from 0b64b98 to c3e6c8b.

Commits

• c3e6c8b cosmo: fix range slider thumb's border-radius in moz, closes #1299
• See full diff in compare view

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[dependabot[bot]]

Superseded by #183.