Remove markdown lint

.github/workflows/rust.yml

@@ -1,4 +1,4 @@
-name: Rustlings Tests
+name: Check
 
 on:
   push:
@@ -19,9 +19,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: DavidAnson/markdownlint-cli2-action@v16
-        with:
-          globs: "exercises/**/*.md"
       - name: rustfmt
         run: cargo fmt --all --check
   test:
@@ -40,4 +37,4 @@ jobs:
       - uses: actions/checkout@v4
       - uses: swatinem/rust-cache@v2
       - name: rustlings dev check
-        run: cargo run -- dev check --require-solutions
+        run: cargo dev check --require-solutions

.markdownlint.yml

@@ -1,2 +0,0 @@
-# MD013/line-length Line length, Expected: 80
-MD013: false