Add DEA Landsat Collection 3 notebook (#706)

* Add first draft of DEA Landsat notebook

* Some wording fixes

* Address review comments

* Add metadata filtering section

* Address Josh comments

* Retire older Landsat notebook

* Fix up a couple of typos

Co-authored-by: Matthew Alger <[email protected]>
Co-authored-by: Claire Krause <[email protected]>