Improve the explanation of context in frontend.mdx and backend.mdx

[adithyaakrishna]

The concept of 'context' in Reclaim Protocol is crucial but could be explained more clearly and comprehensively in both the frontend.mdx and backend.mdx files.

Tasks:

1. In both files, expand the section on context to include:
   • A clear definition of what 'context' means in Reclaim Protocol
   • The importance of context in securing proofs and preventing misuse
   • Detailed explanation of the 'address' and 'message' components of context
2. Add more diverse examples of how context can be used effectively:
   • Example for a blockchain application using the address field
   • Example for a web application using the message field for freshness
   • Example combining both address and message for maximum security
3. Include best practices for generating and verifying context
4. Add a section on common pitfalls or misunderstandings about context
5. Provide code snippets demonstrating how to add, retrieve, and verify context in both frontend and backend implementations
6. Include a troubleshooting section for context-related issues

Enhancing this explanation will help developers better understand and utilize the context feature, improving the security and specificity of their Reclaim Protocol implementations.

Contributors: Please note that by submitting a pull request, you are agreeing to accept and sign the Contributor License Agreement (CLA) found at https://github.com/reclaimprotocol/.github/blob/main/CLA.md