feat: add smart-protocol page (#714)

add smart-protocol page

## Summary by Sourcery

Add the SMART Protocol documentation page to the asset-tokenization
section, detailing its modular smart contract framework, layers (token,
compliance, identity), supported ERC standards, extension modules,
compliance architecture, workflows, comparisons, and use cases.

Documentation:
- Add a new SMART Protocol documentation page under asset-tokenization
with a comprehensive overview, architecture diagrams, ERC standard
implementations, extensions, compliance modules, identity layer, and use
cases.

Chores:
- Update meta.json to include the SMART Protocol page in the
asset-tokenization documentation menu.

Author: gyan-sharma

content/docs/application-kits/asset-tokenization/meta.json

@@ -4,6 +4,7 @@
   "pages": [
     "introduction",
     "deployment",
+    "smart-protocol",
     "signup-and-login",
     "user-management",
     "asset-designer",