docs: Typo Fixes and Documentation Updates

[cypherpepe]

Description

This pull request corrects multiple typographical errors across several files. The following changes have been made:

• Fixed typos in various documentation files, including howitworks.md, libsemaphore.md, what-is-semaphore.md, subgraph.md, identities.mdx, proofs.mdx, page.tsx.
• Corrected spelling errors such as "anonmous" to "anonymous" and "commmitments" to "commitments".
• Adjusted missing unit measurements (e.g., h="630" to h="630px") and cleaned up minor formatting issues.

Other information

These corrections do not introduce any functional changes but improve readability and consistency across the documentation.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn format and yarn lint without getting any errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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