feat(portal): Map apps to consumers

[cloudjumpercat]

Description

Splits the Dev Portal docs from the Identity ones (Dev Portal goes GA next Monday)

Preview Links

/dev-portal/self-service/
/identity/principals/

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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[Copilot]

Pull request overview

This PR reorganizes documentation ahead of Dev Portal GA by moving “developer self-service” content from a Dev Portal landing page into a reference page, and updating Identity/Dev Portal docs to describe application↔principal↔Consumer mapping for plugin application.

Changes:

• Replace the Dev Portal “self-service” landing page with a new reference doc at /dev-portal/self-service/.
• Update principals documentation to include Dev Portal application mapping and add a latency note.
• Update ACE/KAA docs and the Identity landing page to link to the new “apply plugins to applications” guidance.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
app/kong-identity/principals-and-directories.md	Updates principal entity mapping to include Dev Portal applications; adds a latency note under limitations.
app/dev-portal/self-service.md	New reference page consolidating self-service guidance and new “apply plugins” instructions (API + UI).
app/_landing_pages/identity.yaml	Adds a CTA from Identity landing page to the new Dev Portal “apply plugins” section.
app/_landing_pages/dev-portal/self-service.yaml	Removes the old landing-page implementation of the self-service content.
app/_includes/plugins/ace/ace-overview.md	Adds guidance about principal lookups when applying plugins to Dev Portal applications.
app/_includes/dev-portal/kaa-vs-ace.md	Adds guidance about principal lookups for app→Consumer/principal plugin application flows.

[juliamrch]

Added some reviews, they might be out of scope since the content comes from an older file, apply if you find them relevant. Regarding cache, and similar operations, I think it's especially important to avoid passive voice and to clarify what and who does the action. Users sometimes think they are the ones who need to empty the control plane cache, for example.