feat(catalog): Revamp

[cloudjumpercat]

Description

Fixes #5413

TODO:

• app/_landing_pages/catalog.yaml: FAQ about migration, banner currently renders weird don't use the include and create a separate one for just this page that is text that is all a link similar to /dev-portal.yaml
• app/_landing_pages/catalog-classic.yaml: probably also needs the same fix for the note as the other landing page.
• app/_landing_pages/catalog.yaml: and app/_landing_pages/catalog-classic.yaml: FAQ that's an include about the difference between classic and new catalog with a link to the migraiton content
• all the classic pages will need their breadcrumbs and permalinks looked at. Ex. the GitHub integration one is using /catalog/ in the breadcrumbs and that should probably be /catalog-classic/, which also means I think that we're going to need redirects.
• _indices/catalog.yaml: the Classic pages should be moved to their own Classic section but retain the subsections that they are currently in (ex. Services and scorecards will move to the Classic section), also be sure to add the Classic landing page
• app/_how-tos/catalog/monitor-sonarqube-projects-with-konnect-ui.md check this one
• new UI means we have to change some things as MCP registries is included in this release
• complete AI Models page https://docs.google.com/document/d/1W17b_7OJTsEnw_FoYVun2JOk55ipYlwl4vyHRYfMn3A/edit?tab=t.0#heading=h.gfoe2totyqbx

Preview Links

• https://deploy-preview-6586--kongdeveloper.netlify.app/catalog/
• https://deploy-preview-6586--kongdeveloper.netlify.app/catalog-classic/

Checklist

• Tested how-to docs. If not, note why here.
• All pages contain metadata.
• Any new docs link to existing docs.
• All autogenerated instructions render correctly (API, decK, Konnect, Kong Manager).
• Style guide (capitalized gateway entities, placeholder URLs) implemented correctly.
• Every page has a description entry in frontmatter.
• Add new pages to the product documentation index (if applicable).

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