Documentation: remove pre-computed tables from docs, as they don't work

[nickchomey]

Description

As was reported in #1055 (seemingly erroneously closed automatically), and detailed in surrealdb/surrealdb#4881, pre-computed tables - especially when using Group By - do not work. Given that, and the fact that it hasn't even received any attention, it would be appropriate to remove mention of them from the docs (and site, courses/university etc).

At the very least, their functionality should be tested and only the minimal functionality that works should be documented, with a note that they don't work with group by (surely the most powerful and useful of its use cases).

https://surrealdb.com/docs/surrealql/statements/define/table#pre-computed-table-views

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[Dhghomon]

Hi @nickchomey!

Fixes to table views are now being worked on, here is the first one: surrealdb/surrealdb#6442

[nickchomey]

VERY excited to see this get resolved.