docs: Remove tutorials and link to the tutorials page

[toschdev]

Reference to #4236

This removes the Blog tutorial, DeFi Loan tutorial from the docs and links to the tutorials website.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit d40581c):

https://igntservices-docs--pr4240-docs-remove-evergree-4b3kgtkq.web.app

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