Fix handling of newlines and paragraphs

[uhafner]

GitHub and GitLab handle newlines in Markdown differently. All elements are now correctly provided as standalone blocks that can be concatenated on demand.

Will fix #381.

[github-actions]

☀️   Quality Monitor

   🚦   Tests: 78 % successful (❌ 27 failed, ✔️ 97 passed)
   〰️   Line Coverage: 87% (155 missed lines)
   ➰   Branch Coverage: 80% (60 missed branches)
     Mutation Coverage: 0% (0 survived mutations)
     CheckStyle: No warnings
     PMD: 9 warnings (0 error, 1 high, 7 normal, 1 low)
     SpotBugs: No warnings

🚧 Error Messages

Quality Monitor Errors:
No matching report files found when using pattern '**/target/pit-reports/mutations.xml'! Configuration error for 'Mutation Coverage'?

Created by Quality Monitor v1.10.0 (#9c48d50). More details are shown in the GitHub Checks Result.

[github-actions]

☀️   Quality Monitor

   🚦   Tests: 100 % successful (✔️ 124 passed)
   〰️   Line Coverage: 87% (156 missed lines)
   ➰   Branch Coverage: 80% (59 missed branches)
     Mutation Coverage: 75% (163 survived mutations)
     CheckStyle: No warnings
     PMD: 6 warnings (0 error, 1 high, 4 normal, 1 low)
     SpotBugs: No warnings

Created by Quality Monitor v1.10.0 (#9c48d50). More details are shown in the GitHub Checks Result.

[github-actions]

☀️   Quality Monitor

   🚦   Tests: 100 % successful (✔️ 124 passed)
   〰️   Line Coverage: 87% (156 missed lines)
   ➰   Branch Coverage: 80% (59 missed branches)
     Mutation Coverage: 75% (163 survived mutations)
     CheckStyle: No warnings
     PMD: 4 warnings (0 error, 1 high, 2 normal, 1 low)
     SpotBugs: No warnings

Created by Quality Monitor v1.10.0 (#9c48d50). More details are shown in the GitHub Checks Result.