Rust client: Merge tutorials "How to create note with custom logic" & "How to create note in Miden assembly"

Can these two tutorials be merged? Might make sense to clean it up a bit

Find the two tutorials in the repository, likely in a docs or tutorials directory. Compare their content to see where they overlap and how they can be combined. The goal is to create a single, clearer tutorial that covers creating a note with custom logic and Miden assembly. Check for any existing structure or style guide in the repo to maintain consistency.

Written by the indexing model from the issue text.