feat(docs): filter templates page generation based on availables

[alicanerdurmaz]

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Bugs / Features

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What is the current behavior?

/core/templates/<ui>/<backend> routes are generated for every combination of UI framework and backend, even when no templates exist for that combination (e.g. /core/templates/material-ui/supabase/ renders an empty page).

What is the new behavior?

Routes are only generated when at least one template matches the given UI framework + backend combination. Empty filter pages no longer exist.

fixes (issue)

Notes for reviewers

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Latest commit: 185f4a6

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