Update docs, file formatting and docker images (#766)

* docs: fix wrong licence link

* fix: add more formatting settings, reformat all

feat: add vscode extensions recommendations

* docs: update contributing documentation

* fix: remove unnecessary comment

it was due to broken checkout

* docs: rework installation section

it has been brought up few times, new style should be easier
to understand

* docs: update images provided by catthehacker

* docs: replace 18.04 with recent image

* fix: add final new line

.github/actions/choco/action.yml

@@ -1,7 +1,7 @@
 name: 'Chocolatey Packager'
 description: 'Create the choco package and push it'
 inputs:
-  version:  
+  version:
     description: 'Version of package'
     required: true
   apiKey:

.github/actions/composite/action.yml

@@ -10,7 +10,7 @@ outputs:
     description: 'Output string'
     value: ${{ steps.set-output.outputs.string }}
 runs:
-  using: "composite"
+  using: 'composite'
   steps:
     - run: echo Hello ${{ inputs.input }}.
       shell: bash

.github/actions/composite/script.sh

@@ -1 +1 @@
-echo "Output from script"
+echo "Output from script"