feat: change lychee link checker to fail on error (#1272)

Author: TC-MO

.github/workflows/lychee.yml

@@ -8,7 +8,6 @@ on:
 jobs:
     link-check:
         runs-on: ubuntu-latest
-        continue-on-error: true
         steps:
             -   uses: actions/checkout@v4
 
@@ -49,7 +48,3 @@ jobs:
                         --accept '100..=103,200..=299,403..=403,429'
                         --format markdown
                         './build/**/*.html'
-
-            -   name: Add job summary
-                if: always()
-                run: cat ./lychee/out.md >> $GITHUB_STEP_SUMMARY