Use consistent positions for different subviews

[MoritzWeber0]

From the project details page, we have three different subviews (Link Tool, Configure Project, and Configure Model). All three subviews have a different positions for the cards they contain (full-width, centered, on the left). It would be nice for these views to look more consistent

Originally posted by @zusorio in #1901 (comment)

[zusorio]

Making a list of all subviews and their layouts:

• Configure Project (/project/:slug/metadata) → Single Card, on the left
• Configure Model (/project/:slug/model/:slug/metadata) → Single Card, full-width
• Restrictions (/project/:slug/model/:slug/restrictions) → Single Card, full-width, looks kind of wonky
• Model Sources (/project/:slug/model/:slug/modelsources/git-model/:slug) → Single Card, centered
• Edit Git Server Instance (/settings/modelsources/git-instance/:slug) → Single Card, on the left
• Pure Variants (/settings/integrations/pure-variants) → Single Card, centered

There's a few more subviews that have multiple cards on the left. In my opinion, making all subviews left-aligned is probably the way to go.