Why we create this PR?

This PR contains the following changes:

Clean up the scripts
- Refactor the script to set/unset secrets for the local run init-values.sh
Refactor postman collection (DPP and IRS)
Frame agreement conditions added to the mock provider policies and also tested
Reorganize the deployment directory structure and update references in relevant documentation
Update the following documentation:
- Admin Guide (Updated digital twin, asset, policy, contract payloads, configuration the digital twins aspects)
- Getting-started guide
Remove unnecessary/unused files
Update app url from https://materialpass.int.demo.catena-x.net/ to https://dpp.int.demo.catena-x.net/ in all references in the docs

What we want to achieve with this PR?

To provide a reference configuration for the DPP viewer app and update the documentation to comply with current standards

Cleaned up necessary scripts -Refactored the DPP and IRS postman collections
Updated the deployment directory structure
Updated the app url from https://materialpass.int.demo.catena-x.net to https://dpp.int.demo.catena-x.net
Updated the deployment directory structure and their references in relevant documentation
Updated license header and path references in the following readme files:
- Admin guide
- Arc42
- Getting-Started guide
Updated the payloads of asset, policies, contract definition, digital twin and its aspects to align with DPPTriangle document v1.1.0