Add updated STAC notebook

[robbibt]

Updated to document new "filter" functionality implemented in recent updates to ODC Explorer (see opendatacube/datacube-explorer#611)

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[robbibt]

Hey @CEKrause, @benji-glitsos-ga, just tagging you here for awareness - this update is intended as a first pass of improving our STAC documentation. I have some longer term plans for more major changes, probably something like this:

1. Move this guide up a level outside of "DEA web services" to directly under "Access" (STAC isn't a web service, and currently it's far too buried for how important it is as an access mechanism)
2. Convert the guide to a markdown doc containing minimal code (mabe just a simple example of loading data), and move additional code to dedicated notebooks in DEA Notebooks
3. Add subsections/pages documenting how to use STAC in desktop GIS (QGIS and ESRI)
4. Add additional notebooks documenting things like accessing data from our STAC API in other programing languages (like R)

So perhaps something like:

Access
    ↳ SpatioTemporal Asset Catalogue (STAC) -
       ↳ Intro, basic code snippets
       ↳ Loading data from STAC in QGIS
       ↳ Loading data from STAC in ESRI

Notebooks
    ↳ How-to guides
       ↳ Loading data from STAC using `odc-stac`
       ↳ Loading data from STAC using `R`

I think that will get us a huge way down the path to offering a viable mechanism for external data access to DEA outside of the DEA Sandbox, and hopefully be something we can pass on to anyone wanting to load and process large amounts of data.

[Ariana-B]

Looks good, thanks Robbi!