Fixes for server config

This MR solves the following issues:

• fixes inputs for renders_errors and rewrite_policy settings
• removes unnecessary computed properties
• enables source maps for production build

added 12 commits

• b3bb1ff9...5c0b0b5e - 11 commits from branch pleroma:master
• 898631da - Merge branch 'master' into feature/filter-empty-config

Compare with previous version

merged