Release 0.2.0: fix Hi-C QC report rendering and pipeline improvements

- Fix per-sample QC report showing raw Markdown instead of HTML: the
  report template opened with a block-level <center> tag, which made
  python-markdown skip conversion of all enclosed content. Enable the
  md_in_html extension and add markdown="1" to the wrapping block tags.
- Add table styling to the QC report CSS (collapsed borders, padded
  cells, dark header row).
- bwa_split: replace 32-bit seqkit split2 (crashes on large inputs) with
  sequana fastq-split; use -5SP -M bwa options and split_fasta container.
- Add qc3c report to pipeline targets for both chromap and bwa paths.
- Bump version to 0.2.0, set status to Production, update changelog.
- Expand test suite with lightweight setup/config-validation tests.

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Merge pull request #3 from sequana/copilot/fix-test-filenames

Fix test reference filename to match actual test data file