Native onchain development - Updated program derived address lesson

[0xCipherCoder]

Problem

Summary of Changes

• Updated content as per given guidelines.
• Updated styling and grammar fixes
• Updated code snippets with latest Rust and solana program
• Updated program code and updated links

Fixes #

Unboxed PRs Movie program starter - https://github.com/Unboxed-Software/solana-movie-program/pull/8 Movie program solution - https://github.com/Unboxed-Software/solana-movie-program/pull/9 Student intro starter - https://github.com/Unboxed-Software/solana-student-intro-program/pull/1 Student intro solution - https://github.com/Unboxed-Software/solana-student-intro-program/pull/2