Squashed commit of the following:

* chore(subject sort): change weight to sort the TPs logically

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(tags): add more precise tags

* chore(CONTRIBUTING): adapt the contributing file

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(README): change the web verison of the microbit IDE

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* fix(front-matter): remove front matter from section files

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(tags): add tags to existing subjects

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(example subject): refers to the theme example subject

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(logos): use config file to choose logo and favicon

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* fix(decouverte micropython): fix section sorting

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* fix(netlify): fix build command

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* fix(CI): unknown command 'make'

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(microbit snake): divide the subject in multiple files

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(decouverte micropython): divide the subject in multiple files

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(chifoumicrobit): divide the subject in multiple sections

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(build method): change the build method to fit with v2 method

Signed-off-by: Grégoire Lefaure <gregoire.lefaure@prologin.org>

* chore(deps): update themes/gcc digest to ca62a2e

Signed-off-by: Prologin Renovate <renovate@prologin.org>