Update doc switcher & readme doc

[leehart]

Re: issue #843

[leehart]

Noting linting failure here, which was addressed in draft PR #842

• https://github.com/malariagen/malariagen-data-python/actions/runs/21061650460/job/60569151449?pr=844

malariagen_data/anoph/sample_metadata.py:1158: error: Name "pd.core.series.Series" is not defined [name-defined]
Found 1 error in 1 file (checked 98 source files)

I'll transfer the linting fixes from #842 to here as required.

[leehart]

Noting random test failure:

=========================== short test summary info ============================
FAILED tests/anoph/test_snp_frq.py::test_allele_frequencies_advanced_with_area_by[adir1_sim-country] - ValueError: No SNPs remaining after applying variant query "effect in ['NON_SYNONYMOUS_CODING', 'START_LOST', 'STOP_LOST', 'STOP_GAINED']".
=========== 1 failed, 900 passed, 333 warnings in 1088.05s (0:18:08) ===========

[leehart]

Noting random failure during coverage tests:

=========================== short test summary info ============================
FAILED tests/anoph/test_cnv_frq.py::test_gene_cnv_frequencies_with_max_coverage_variance[ag3_sim-1] - Failed: DID NOT RAISE <class 'ValueError'>
=========== 1 failed, 900 passed, 315 warnings in 1946.95s (0:32:26) ===========

• https://github.com/malariagen/malariagen-data-python/actions/runs/21061927392/job/60570034669?pr=844

[leehart]

All CI checks have passed on this PR, for the time being. Ready for review.

[leehart]

@jonbrenas OK to merge this one in?

[jonbrenas]

Thanks, @leehart.

LGTM. I was wondering if it wouldn't make more sense to have Pf7 above Pf8 in the README but it keeps the order on parasite-data so I assume there is a reason why they are in this order.

[leehart]

Thanks @jonbrenas . I suppose the latest versions and newest content are often towards the top of a list or page, to prioritise over or highlight above older stuff, and perhaps for convenience in some cases, but it's also natural for content to build on previous context, as implied, so I guess that can be a style decision. I'm not sure what my rationale was at the time, but I guess I might have been reflecting the parasite-data docs, as you suggest, or maybe the version switcher. In any case, the order will be easy enough to change later, if needs be.