Feature/source links

[Laserroy]

Closes #278

[codecov-commenter]

Codecov Report

Merging #305 into master will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master     #305      +/-   ##
============================================
- Coverage     74.21%   74.17%   -0.05%     
  Complexity      120      120              
============================================
  Files            46       46              
  Lines           512      515       +3     
============================================
+ Hits            380      382       +2     
- Misses          132      133       +1     

Impacted Files	Coverage Δ	Complexity Δ
app/Helpers/ExerciseHelper.php	66.66% <0.00%> (ø)	0.00 <0.00> (ø)
app/Helpers/ChapterHelper.php	36.36% <66.66%> (+11.36%)	0.00 <0.00> (ø)

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