Remove markdown dead link check (#4839)

# Objective

This fails constantly and causes more pain than it is worth.

## Solution

Remove dead link checks.

Alternative to #4837, which is more granular but ironically still fails to build. I'm in favor of the nuclear option.

Fixes #4575

.github/bors.toml

@@ -7,7 +7,6 @@ status = [
     "build-wasm (nightly, ubuntu-latest)",
     "build-android",
     "markdownlint",
-    "check-markdown-links",
     "run-examples",
     "check-doc",
     "check-missing-examples-in-docs",

.github/linters/markdown-link-check.json

@@ -1,27 +0,0 @@
-{
-  "ignorePatterns": [
-    {
-      "pattern": "^https?://github\\.com/"
-    },
-    {
-      "pattern": "^https?://docs\\.github\\.com/"
-    },
-    {
-      "pattern": "^https?://reddit\\.com/"
-    }
-  ],
-  "replacementPatterns": [],
-  "httpHeaders": [
-    {
-      "urls": ["https://crates.io"],
-      "headers": {
-        "Accept": "text/html"
-      }
-    }
-  ],
-  "timeout": "20s",
-  "retryOn429": true,
-  "retryCount": 5,
-  "fallbackRetryDelay": "30s",
-  "aliveStatusCodes": [200, 206]
-}

.github/workflows/ci.yml

@@ -200,55 +200,6 @@ jobs:
           # Not needed here as only one Linter is used.
           #GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-  check-markdown-links:
-    runs-on: ubuntu-latest
-    needs: markdownlint
-    if: always()
-    steps:
-    - uses: actions/checkout@v3
-    - name: check dead links
-      continue-on-error: true
-      id: run1
-      uses: gaurav-nelson/github-action-markdown-link-check@9710f0fec812ce0a3b98bef4c9d842fc1f39d976
-      with:
-        use-quiet-mode: 'yes'
-        use-verbose-mode: 'yes'
-        config-file: '.github/linters/markdown-link-check.json'
-    - name: Sleep for 30 seconds
-      if: steps.run1.outcome=='failure'
-      run: sleep 30s
-      shell: bash
-    - name: check dead links (retry)
-      continue-on-error: true
-      id: run2
-      if: steps.run1.outcome=='failure'
-      uses: gaurav-nelson/github-action-markdown-link-check@9710f0fec812ce0a3b98bef4c9d842fc1f39d976
-      with:
-        use-quiet-mode: 'yes'
-        use-verbose-mode: 'yes'
-        config-file: '.github/linters/markdown-link-check.json'
-    - name: Sleep for 30 seconds
-      if: steps.run2.outcome=='failure'
-      run: sleep 30s
-      shell: bash
-    - name: check dead links (retry 2)
-      continue-on-error: true
-      id: run3
-      if: steps.run2.outcome=='failure'
-      uses: gaurav-nelson/github-action-markdown-link-check@9710f0fec812ce0a3b98bef4c9d842fc1f39d976
-      with:
-        use-quiet-mode: 'yes'
-        use-verbose-mode: 'yes'
-        config-file: '.github/linters/markdown-link-check.json'
-    - name: set the status
-      if: always()
-      run: |
-        if ${{ steps.run1.outcome=='success' || steps.run2.outcome=='success' || steps.run3.outcome=='success' }}; then
-            echo success
-        else
-            exit 1
-        fi
-
   run-examples:
     runs-on: ubuntu-latest
     steps: