Point DEA Intertidal KH link to product page, not notebook (#1219)

Include a brief description of the changes being proposed, and why they are necessary.

(Replace [ ] with [x] to check off)

[ ] Notebook created using the DEA-notebooks template
[ ] Remove any unused Python packages from Load packages
[ ] Remove any unused/empty code cells
[ ] Remove any guidance cells (e.g. General advice)
[ ] Ensure that all code cells follow the PEP8 standard for code. The jupyterlab_code_formatter tool can be used to format code cells to a consistent style: select each code cell, then click Edit and then one of the Apply X Formatter options (YAPF or Black are recommended).
[ ] Include relevant tags in the final notebook cell (refer to the DEA Tags Index, and re-use tags if possible)
[ ] Clear all outputs, run notebook from start to finish, and save the notebook in the state where all cells have been sequentially evaluated
[ ] Test notebook on both the NCI and DEA Sandbox (flag if not working as part of PR and ask for help to solve if needed)
[ ] If applicable, update the Notebook currently compatible with the NCI|DEA Sandbox environment only line below the notebook title to reflect the environments the notebook is compatible with
[ ] Check for any spelling mistakes using the DEA Sandbox's built-in spellchecker (double click on markdown cells then right-click on pink highlighted words). For example:

sandbox_spellchecker

GeoscienceAustralia / dea-notebooks