Update Dokka version references to 2.1.0 (#4297)

- update examples to use DGPv1

(cherry picked from commit 706b7c3)

Build the Dokka Maven Plugin with the lastest compiler version (#4228)

(cherry picked from commit 3d5926a)

Update Kotlin/Dokka version references to 2.0.0 (#3957)

(cherry picked from commit fc574c8)

Update Dokka version to 2.0.0-Beta

Update Kotlin/Dokka version references to 1.9.20 (#3510)

(cherry picked from commit 7ccc48e)

Update Dokka's references to 1.9.10 (#3210)

(cherry picked from commit 9bbcc21)

Update Dokka's references to 1.9.0

Update Dokka's references to 1.8.20 (#3028)

(cherry picked from commit bb1c151)

Do no render Types tab when there are no types (#2900)

(cherry picked from commit dca5c31)

Change log level to INFO for messages about alpha plugin versions (#2693

)

(cherry picked from commit 8317436)