fix: align docs-as-code integration with current setup guide

[umaucher]

Sets project/project_url/external_needs directly in the docs() macro call and switches to the needs_json_file targets, per the current docs-as-code setup guide. This also removes the need for the downstream 003-fix-docs-version.patch in reference_integration (follow-up PR).

With further fixes the docs/conf.py file can be removed completely.

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run --lockfile_mode=error //:license-check

Status: ⚠️ Needs Review

Click to expand output

[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.6.0) and connecting to it...
INFO: Invocation ID: 265f7467-848a-4391-a322-f3684eb2ea7b
Computing main repo mapping: 
Computing main repo mapping: 
Computing main repo mapping: 
Loading: 
Loading: 3 packages loaded
Loading: 3 packages loaded
    currently loading: 
Loading: 3 packages loaded
    currently loading: 
Loading: 3 packages loaded
    currently loading: 
Analyzing: target //:license-check (4 packages loaded, 0 targets configured)
Analyzing: target //:license-check (4 packages loaded, 0 targets configured)

Analyzing: target //:license-check (75 packages loaded, 10 targets configured)

Analyzing: target //:license-check (90 packages loaded, 10 targets configured)

Analyzing: target //:license-check (90 packages loaded, 10 targets configured)

Analyzing: target //:license-check (149 packages loaded, 3125 targets configured)

Analyzing: target //:license-check (149 packages loaded, 3125 targets configured)

Analyzing: target //:license-check (149 packages loaded, 3125 targets configured)

Analyzing: target //:license-check (160 packages loaded, 9292 targets configured)

Analyzing: target //:license-check (161 packages loaded, 9312 targets configured)

Analyzing: target //:license-check (167 packages loaded, 9445 targets configured)

Analyzing: target //:license-check (171 packages loaded, 11450 targets configured)

INFO: Analyzed target //:license-check (177 packages loaded, 11510 targets configured).
[9 / 17] checking cached actions
INFO: From Generating Dash formatted dependency file ...:
INFO: Successfully converted 66 packages from Cargo.lock to bazel-out/k8-fastbuild/bin/formatted.txt
[15 / 17] JavaToolchainCompileBootClasspath external/rules_java+/toolchains/platformclasspath.jar; 0s disk-cache, processwrapper-sandbox
INFO: Found 1 target...
Target //:license.check.license_check up-to-date:
  bazel-bin/license.check.license_check
  bazel-bin/license.check.license_check.jar
INFO: Elapsed time: 27.612s, Critical Path: 1.81s
INFO: 17 processes: 12 internal, 4 processwrapper-sandbox, 1 worker.
INFO: Build completed successfully, 17 total actions
INFO: Running command line: bazel-bin/license.check.license_check ./formatted.txt <args omitted>
usage: org.eclipse.dash.licenses.cli.Main [-batch <int>] [-cd <url>]
       [-confidence <int>] [-ef <url>] [-excludeSources <sources>] [-help] [-lic
       <url>] [-project <shortname>] [-repo <url>] [-review] [-summary <file>]
       [-timeout <seconds>] [-token <token>]

[github-actions]

The created documentation from the pull request is available at: docu-html