sig#805 - Align ssi-authority-schema-registry documentation structure with updated TRG 1

[MaximilianHauer]

Description

To enhance the consistency and ease of understanding of our products for the open community, TRG 1 was updated.
Make sure to comply with the updated structure:

repository
└─── docs/
    └─── architecture/
    └─── admin/
    └─── user/
    └─── api/
    └─── README.md

Please TRG 1.05-1.08 for more information:
https://eclipse-tractusx.github.io/docs/release/trg-1/trg-1-05
https://eclipse-tractusx.github.io/docs/release/trg-1/trg-1-06
https://eclipse-tractusx.github.io/docs/release/trg-1/trg-1-07
https://eclipse-tractusx.github.io/docs/release/trg-1/trg-1-08

Acceptance Criteria

• Adjust the repo related documentation based on trg 1.05 - gather all architecture documentations into docs/architecture
• Adjust the repo related documentation based on trg 1.06 - gather admin related docu into docs/admin
• Adjust the repo related documentation based on trg 1.07 - gather end-user related documentation into doc/user
• Adjust the repo related documentation based on trg 1.08 - Clarify the setup with Evelyn ;)
• Adjust the docs/README.md regarding your changes
• Ensure that all documentation is in English

Additional Information