Merge Cloud Tutorials with new Guides section

[matkuliak]

About

While the Tutorials (https://cratedb.com/docs/cloud/en/latest/tutorials/index.html) articles in cloud docs are great content, they are not really Cloud specific. Moving them to the new Guide (https://cratedb.com/docs/guide/) section sounds more reasonable.
https://cratedb.com/docs/cloud/en/latest/tutorials/index.html -> https://cratedb.com/docs/guide/

References

• Move Cloud tutorials to Guide cratedb-guide#70

[matkuliak]

Merged:
#70
crate/cratedb-guide#70

cc @proddata