Add virus configs

[LaraFuhrmann]

I added config files and references for poliovirus and drosophila c virus.
A short description with accession numbers for samples use is in the top of the config-files.

Let me know if something should be added.

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ BASH	shellcheck	11		0	0.56s
✅ DOCKERFILE	hadolint	1		0	0.32s
✅ JUPYTER	jupyfmt	3	0	0	2.45s
❌ MARKDOWN	markdownlint	14	2	3	1.32s
✅ PERL	perlcritic	1		0	0.91s
✅ PYTHON	black	62	1	0	2.0s
✅ SNAKEMAKE	snakefmt	25	0	0	8.85s

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[LaraFuhrmann]

I added a README to this branch for the global haplotype reconstruction study. This should not cause any problems.

[LaraFuhrmann]

I added clearer links to the tutorials, and made a subsection Tutorials as requested by the reviewer.