fix: broken links README.md

[cypherpepe]

Description

This PR fixes broken links in the README.md file to ensure all references point to the correct resources.

Time spent on this PR

0.2 days

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Current behavior

Currently, some links in the README.md are outdated or broken, causing navigation issues for readers.

Resolves: No linked issue

New behavior

• Updated the precompiles link to point to the correct cairo-precompiles page.
• Fixed the test RLP library link to use the correct relative path.
• Updated the deploy script link to point to the correct file location.