(description by dennisvang)

This PR introduces support for the "index gatekeeper", a.k.a. index permits.
Admin users can now decide whether or not to include an FDP into the index.
When a ping is received from an unknown FDP, it is not included in the list, but gets a pending status.
The admin can review, and then accept or reject the FDP.

In addition, this PR enables the client to deal with both normal fdps and fdp-indexes, without explicit (docker) configuration.
As a result, there is no longer the need for separate fdp-client and fdp-index-client docker images.
The client automatically recognizes that an fdp is an index, by checking the index member in the response from the fdp's /configs/bootstrap endpoint (see e.g. https://app.fairdatapoint.org/swagger-ui/index.html#/Client/getBootstrapConfig).

Changes as summarized by Copilot:

This pull request introduces several changes across multiple files in the FAIRDataPoint-client project:

1. API Changes (src/api/fdpIndex/index.ts):

   • Added permit parameter to getEntries method.
   • Introduced a new putEntry method for updating entries.

2. Component Changes (src/components/EntityView/index.vue):

   • Added navigation tabs for "Index" and "Metadata" views.
   • Introduced FairDataPoints component and dynamic content rendering based on viewIndex.

3. Header Component (src/components/FdpHeader/index.vue):

   • Modified dropdown menu to include "Trigger ping" and "Index Settings" for admins when isIndex is true.

4. Page Component (src/components/Page/index.vue):

   • Added a slot for pagenav.

5. Entity Configuration (src/entity/EntityConfig.ts and src/entity/RepositoryConfig.ts):

   • Added isRepository getter to both classes.

6. Main Configuration (src/main.ts):

   • Set configuration for index.

7. Router Configuration (src/router/index.ts):

   • Modified routes to include index settings and adjusted route logic for isIndex.

8. Index Detail View (src/views/IndexDetail/index.vue):

   • Added permit handling and UI elements for changing permit status.

9. Index Settings View (src/views/IndexSettings/index.vue):

   • Added "Auto Permit" checkbox and handling in the form.

10. Removed File (src/views/Index/index.vue):

    • Deleted the Index view file.

These changes enhance the functionality related to index management, including new API methods, UI components for viewing and managing entries, and updated configurations and routing.