Cardano Updates

- Updated custom CSS to enhance layout consistency, including centering the navbar and main wrapper.
- Removed the proxy URL from the configuration.
- Adjusted styles for the theme edit button and sidebar to improve user experience.
- Deleted the outdated API specification file to streamline documentation.

- Updated API title to reflect rebranding to Mesh API.
- Enhanced some endpoint descriptions for clarity and accuracy (network status, options, block transaction).
- Added detailed descriptions for Cardano-specific transaction and block metadata.
- Commented out unimplemented mempool endpoints and related documentation.
- Improved Docusaurus configuration for better user experience, including last update timestamps .
- Updated CSS for improved layout and styling consistency across documentation pages.

- Updated example values for block, account and transaction identifiers to align with current data.
- Enhanced operation types and statuses to include Cardano-specific options.
- Added valid response examples to improve clarity.
- Commented out unimplemented features and provided TODO notes for future implementation.

- Upgraded the OpenAPI generator Maven plugin from version 6.4.0 to 7.13.0.
- Simplified example values in the API specification by removing unnecessary array structures for 'network' and 'status' fields.

Remove multiple 'examples' entries from schema definitions ('Operation', 'NetworkIdentifier'). These were intended solely for enhanced rendering in Scalar docs but caused spec-validation failures during CI builds.

Single 'example' per schema retained to ensure OpenAPI compliance and fix build errors.

This commit also updates:

Bouncycastle to jdk 18 and version 1.80
Ed25519 BIP32 Rust library to rust 28.3

Signed-off-by: goncalo-frade-iohk <[email protected]>

Update TxInsReference haddock to mention public key inputs

Co-authored-by: Sasha Bogicevic <[email protected]>