Expanded `examples/main.go` to fully demonstrate the functionality of the `crypt`, `enchantrix`, and `trix` packages.
- Restructured the main example file into distinct functions for each feature set (`demoTrix`, `demoHashing`, `demoChecksums`, `demoRSA`, `demoSigils`).
- Implemented a comprehensive `demoTrix` that showcases a chain of multiple sigils (`json-indent`, `gzip`, `base64`, `reverse`), checksum functionality, and the full Pack/Unpack workflow.
- Added a `demoHashing` function that iterates through all supported hashing algorithms.
- Added a `demoChecksums` function that demonstrates the Luhn and Fletcher algorithms.
- Added a `demoRSA` function that shows the complete RSA workflow from key generation to decryption.
- Added a `demoSigils` function to demonstrate sigil transformations independently.
- Fixed a bug in the Trix demo verification logic related to JSON indentation.
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