Image links are not checked in md files

[marcindulak]

The example below uses docker #23

1. build the image of the latest linkspector from source

   git clone https://github.com/UmbrellaDocs/linkspector
   cd linkspector
   docker build --build-arg LINKSPECTOR_PACKAGE= -t umbrelladocs/linkspector .
   

2. run linkspector check on a test directory

   mkdir test
   cp .gitignore test  # due to https://github.com/UmbrellaDocs/linkspector/issues/24
   echo '![test](test-missing.png "test")' > test/test.md
   docker run --rm -it -v $PWD/test:/app --name linkspector umbrelladocs/linkspector bash -c 'linkspector check'
   

Output

⠋ Configuration file not found. Using default configuration.
✨ Success: All hyperlinks in the specified files are valid.

An error due to a missing image link is expected.

[marcindulak]

It does not appear to me that this is fixed using c35eb55.

Please use the test instructions provided in the issue description (cp .gitignore test is no longer needed), and reopen the issue if needed.