fix: address feedback bugs

[dutterbutter]

What :computer:

• Fixes the posted bugs:
• https://linear.app/matterlabs/issue/DEVRL-512/[hello-zksync-page]-incorrect-link-contracts-directory-leads-to-404
• https://linear.app/matterlabs/issue/DEVRL-515/[hello-zksync-page]-deploy-the-contract-block-incorrect-link
• https://linear.app/matterlabs/issue/DEVRL-531/add-information-about-crown-token-claim

Why :hand:

• Improves the docs

Evidence :camera:

Include screenshots, screen recordings, or console output here demonstrating that your changes work as intended

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 74b0b7e):

https://zksync-docs-staging-5eb09--pr53-db-fix-bugs-32d5bqc6.web.app

_{(expires Wed, 15 May 2024 19:05:10 GMT)}

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