fix: aligned external links format

[amelnytskyi]

What :computer:

• aligned external links format to remove link_link URLs
• fixed 404 link for Pyth

Why :hand:

• Reason why first thing was added to PR
• Reason why second thing was added to PR
• Reason why third thing was added to PR

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 bbabe32):

https://zksync-docs-staging-5eb09--pr65-qa-fixing-links-wi39t071.web.app

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[dutterbutter]

Once #63 is merged the spell check job will pass. Please wait until then.

[dutterbutter]

@amelnytskyi resolve conflicts and we are good here.

[amelnytskyi]

@amelnytskyi resolve conflicts and we are good here.

@dutterbutter conflicts fixed