fix(docs): Fix back to top button display #20436

Job	Run time
Check smoketests/mod.rs is complete	2m 30s
Check CI command docs	58s
Test spacetimedb-update flow (x86_64-unknown-linux-gnu)	1m 23s
Test spacetimedb-update flow (aarch64-unknown-linux-gnu)	51s
Test spacetimedb-update flow (aarch64-apple-darwin)	2m 30s
Check that packages are publishable	20s
Verify global.json files are symlinks	1m 8s
Check for Python smoketest edits	10s
Check CLI docs	2m 34s
Lints	2m 30s
Test spacetimedb-update flow (x86_64-pc-windows-msvc)	2m 19s
Build and test wasm bindings	2m 30s
Verify LLM benchmark is up to date	0s
Unreal Engine Tests	0s
Internal Tests	1s
Test Suite	1s
Smoketests (${{ matrix.name }})	1s
csharp-testsuite	1s
unity-testsuite	1s
	19m 48s

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