🏗️(bin) merge duplicated folders scripts and bin

Few scripts were duplicated between the scripts and the bin folders.
Reorganize the scripts in a common folder, and align filenames to
follow the same rule.

bin/update-git-submodule.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+git submodule update --init --recursive
+git submodule foreach 'git fetch origin; git checkout $(git rev-parse --abbrev-ref HEAD); git reset --hard origin/$(git rev-parse --abbrev-ref HEAD); git submodule update --recursive; git clean -dfx'