Remove GitHub Pages deployment automation

From now on, `gh-pages` branch will contain an `index.html` file that redirects to ReadTheDocs. Edits to that `index.html` file will be manual edits and probably reviewed with PRs. There's nothing to build anymore.
nsidc · Nov 22, 2023 · 7b652f1 · 7b652f1
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diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml