fix(markdown, front): no bug in rendering code

* Fixed bug with incorrect HTML structure rendered for code blocks in markdown

Fixes #92
9 jobs for master in 4 minutes and 50 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Check
passed #481875
docker
check_back

00:00:21

passed #481876
docker
check_front

00:01:11

 
  Test
passed #481877
docker
test_back

00:00:40

87.0%
passed #481878
docker
test_frontend

00:00:57

 
  Lint
passed #481880
docker
eslint

00:01:02

passed #481879
docker
flake8

00:00:12

 
  Svg Gen Docu
passed #481881
docker
generate_UML_svg

00:00:12

 
  Documentation
passed #481882
docker
pages

00:00:12

 
  Deploy
passed pages:deploy

00:00:00