Backport formatting from Julia course (2022-06-08)

Mainly code highlights, uncluttering and pictures.

@laurent.heirendt is there a place to document the use of .leader and the emoji for theme users?

Refs to what this looks like:

• https://courses.lcsb.uni.lu/2022-06-08_JuliaForNewcomers/latest/#/4
• https://courses.lcsb.uni.lu/2022-06-08_JuliaForNewcomers/latest/#/5

requested review from @laurent.heirendt

assigned to @miroslav.kratochvil

I think you can document here in the repo, maybe README.md?

added 1 commit

• a4c8d078 - document what's in the theme

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mentioned in commit a9fbf17a

merged