Untangle settings / header slots

[anbraten]

• extract warning from settings component (use slot instead)
• grow search box width
• move docs link after title instead of description (was previously not visible when no description was set)
• rename desc => description and some slot names
• tested for desktop & mobile

[6543]

file conflict :/

[woodpecker-bot]

Tearing down https://woodpecker-ci-woodpecker-pr-4403.surge.sh