add llm plugin

[darkobas2]

according to https://github.com/ethersphere/DevRel/issues/716

@crtahlin @GasperX93

• 2. Root Domain Strategy: This is outside the scope of the current repository.
• 3. Content Structure Guidelines: The docusaurus-plugin-llms plugin is configured to include the
     docs/develop/, docs/api/, and docs/learn/technology/** directories, and to exclude the
     docs/learn/ecosystem/** and docs/desktop/** directories. This aligns with your request to
     prioritize developer-focused content.
• 4. CI/CD Integration: The docusaurus-plugin-llms plugin automatically generates the llm.txt file
     during the npm run build process, which is already part of the CI/CD pipeline in the gh-pages.yaml
     file. No changes are needed here.
• 5. Analytics Integration: I have not implemented any analytics, but it is possible to do so by configuring
     server-side logging or using a tool like Matomo.
• 6. Directory Registration: Registering the llm.txt file with directories is a manual process

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