Start release candidate (#152)

v0.4.9 release candidate (#140)

v0.4.8 release candidate (#134)

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v0.4.6 release candidate (#128)

Start v0.4.5 release candidate

Start release candidate

Start v0.4.3 release candidate

Start v0.4.2 release candidate (#110)

* Start v0.4.2 release candidate

* urlchecker; document with new roxygen version

Update Quarto themes doc URL