Documentation, coverage & passivation

What's Changed

• Add scaladoc for most types by @jchapuis in #22
• Bake in Option[S] by @jchapuis in #23
• Update scalafmt-core to 3.0.7 by @scala-steward in #24
• Various minor scaladoc improvements by @jchapuis in #28
• Add logo by @jchapuis in #29
• Bootstrap documentation website by @julienrf in #25
• Update sbt-paradox to 0.9.2 by @scala-steward in #30
• Add EntityTSuite by @jchapuis in #26
• Tests for example app by @jchapuis in #27
• Passivation support by @jchapuis in #31
• Fix doc by @jchapuis in #35
• Update sbt-scoverage to 1.9.2 by @scala-steward in #34
• More doc fixes by @jchapuis in #36

Full Changelog: v0.1.0...v0.2.0