Don't clobber files & update dependencies

What's Changed

• fix: use BIC_OVERWRITE when cping static/ too by @Pinjasaur in #21
• feat: replace bashids with sqids by @Pinjasaur in #23

Replacing Hashids with Sqids is a backwards incompatible change that will cause duplicated entries in RSS readers. See #20 for more details.

Full Changelog: v1.0.0-beta.3...v1.0.0-beta.4