v0.19.0-beta2

Changelog

• cb25f0d Add hint for reverse proxying with Apache
• 8dadb04 Mark -n and --namespace as deprecated
• 6d669c6 Migrate namespace_id to user_id column in machine and pak
• 9714900 Target Tailscale 1.36.0
• 0ffff2c Update the node join instruction to reference "username"
• 9f6e546 modify the test to reflect the changes on the webinterface
• c720af6 permalink in the limitations section to tailscale
• 9c2e580 put Where before Find