feat: Link directly to doc semantic framework

[cpb8010]

This was unclear if not already familiar with the framework and avoids conflating this with eastern orthodoxy liturgy

What :computer:

• Replace the text Diataxis with a link to the diataxis page in the header section
• Replace the text Diataxis with a link to the diataxis page in the category section

Why :hand:

• I hadn't heard of this framework before *Searching for this text brings up some conflicting results depending on what site you trust

Evidence :camera:

From here: https://zksync-docs-staging-5eb09--pr37-cbe-devrl-527-link-t-lxa3l56t.web.app/build/contributing-to-documentation/documentation-styleguide

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit a294467):

https://zksync-docs-staging-5eb09--pr37-cbe-devrl-527-link-t-lxa3l56t.web.app

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