Convert to markdown + mkdocs

[ewels]

Converted training material to markdown, using mkdocs material.

Reasoning:

• We want to standardise on using markdown everywhere
• We may soon want to support internationalisation, mkdocs material does this well
• More consistent with other docs
• Better styling, navigation, accessibility
• Timing: May be moving from Seqera to Nextflow branding for the training material

Potentially controversial points:

• I deleted the AWS docs as these aren't used anywhere
  • About half of the content is duplicated into the executors / deployment scenarios docs
  • The docs are long and super detailed. They're not used anywhere that I can see, which makes them high risk for drifting out of date. IMHO better to delete - they're in the git history if we need them in the future.

TODO:

• Convert asciidoc files to markdown using this method
• Set up prettier markdown formatting
• Set up mkdocs
• Convert asciidoc admonitions to mkdocs material
• Repeat for nextflow-handson training
• Manually review all markdown files
  • index.md
  • setup.md
  • intro.md
  • rnaseq_pipeline.md
  • containers.md
  • channels.md
  • processes.md
  • operators.md
  • groovy.md
  • modules.md
  • config.md
  • executors.md
  • tower.md
  • cache_and_resume.md
  • debugging.md
• Set up translations
• Look into numbered headings
  • Add plugin
  • Reset numbering for each training (uncomment code in mkdocs.yml when Add new option 'restart_increment_after' timvink/mkdocs-enumerate-headings-plugin#33 merged + released)

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[gitpod-io]

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[ewels]

Approved on Seqera Slack in the #training channel ✅