Updating all DEA Knowledge Hub links in entire repo

[benji-glitsos-ga]

Reason for this pull request

The URL of Geoscience Australia's DEA Knowledge Hub has changed to https://knowledge.dea.ga.gov.au/

Proposed changes

• In the entire repo, change all "docs.dea.ga.gov.au" links to "knowledge.dea.ga.gov.au".

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📚 Documentation preview 📚: https://datacube-core--1559.org.readthedocs.build/en/1559/

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.77%. Comparing base (bfb8417) to head (56a7f01).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #1559 +/- ## ======================================== Coverage 91.77% 91.77% ======================================== Files 132 132 Lines 14631 14631 ======================================== Hits 13428 13428 Misses 1203 1203 ```

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[benji-glitsos-ga]

Thank you!