Fix bugs due to merging TEMPLATE Sync PR

[maxulysse]

nf-core/sarek pull request

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[maxulysse]

Issue is due to incompatibility within the conda environment.
Manta needs python 2.7.
The new markdown_to_html.py script a more recent one.
Hence issue on the scripts, which is why it's failing, plus the docker isn't building due to the incompatibility issues.
So I'm reverting to the markdown_to_html.r script, and I'll be very happy to work more on DSL 2

[maxulysse]

It's failing, because the docker image is still the old one without the new environment, so I'm building one locally, pushing it to Docker Hub and then restarting the tests

[maxulysse]

Now failure due to :warning: emoji (:warning:), so I'm replacing it with /!\

[ggabernet]

Just have one comment about the python version, otherwise LGTM