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This adds board and competency labels to almost all articles. Articles
that are general or are just descriptive (no action needed) are left
out.

Data collection setup was split to separate article.
Also Shield was added to few places.

It looks better with a green accent warning than with an orange one.
Also, that is a signal for user that something is relevant but not broken.

Must be the first thing in the file.
Please check README.md for a reference.

Example:
---
board: mox
competency: expert
---

Also few words. It affects only script of USB reflash.

We haven't published video officially yet and although it leaked, we
shouldn't point to the leaked version. So let's use local copy for now.

Since Ubuntu 20.04 LTS, there is no package python-pip.
It is available to install python3-pip and if you would like to try to use pip,
it does not work. Because there is just pip3.

microsd: Fix symlink target to be future proof

See merge request !129

Upstream now supports changes we did to theme trough custom CSS so we no
longer have to include our own fork.