Remove Tutorials from the cloud docs

[matkuliak]

What's Inside

We're moving the 4 tutorials from Cloud to Guide docs

Preview

https://crate-cloud--70.org.readthedocs.build/en/70/

Highlights

Removed:

• https://cratedb.com/docs/cloud/en/latest/tutorials/time-series.html
• https://cratedb.com/docs/cloud/en/latest/tutorials/object.html
• https://cratedb.com/docs/cloud/en/latest/tutorials/full-text.html
• https://cratedb.com/docs/cloud/en/latest/tutorials/time-series-advanced.html
• Tutorials left-hand menu item
• Mentions/references to the pages

Checklist

• Link to issue this PR refers to (if applicable): Merge Cloud Tutorials with new Guides section #68
• CLA is signed

References

• Move Cloud tutorials to Guide cratedb-guide#70

[amotl]

Thank you. Please wait with merging and applying redirects until we get the designated target locations right.

• Move Cloud tutorials to Guide cratedb-guide#70 (review)

[matkuliak]

Waiting with everything related to #68