Make docs:check-links task Windows compatible.

`npx --call` uses the native shell. This means the shell code used by the task does not work on Windows.

 After quite a bit of unsuccessful efforts, I decided that it is simply too difficult to use npx for this application on
 Windows. So the Windows user is required to have markdown-link-check installed and in PATH. Because Task uses an
 integrated shell interpreter, shell code is usable as long as it is not wrapped in a `npx --call` command.

Author: per1234

Taskfile.yml

@@ -196,13 +196,41 @@ tasks:
     desc: Check for dead links in documentation
     cmds:
       - |
-        npx --package markdown-link-check --call '
-        STATUS=0
-        for file in $(find -name "*.md"); do
-          markdown-link-check --quiet "$file"
-          STATUS=$(( $STATUS + $? ))
-        done
-        exit $STATUS'
+        if [[ "{{.OS}}" == "Windows_NT" ]]; then
+          # npx --call uses the native shell, which makes it too difficult to use npx for this application on Windows,
+          # so the Windows user is required to have markdown-link-check installed and in PATH.
+          if ! which markdown-link-check &>/dev/null; then
+            echo "markdown-link-check not found or not in PATH. Please install: https://github.com/tcort/markdown-link-check#readme"
+            exit 1
+          fi
+          # Default behavior of the task on Windows is to exit the task when the first broken link causes a non-zero
+          # exit status, but it's better to check all links before exiting.
+          set +o errexit
+          STATUS=0
+          # Using -regex instead of -name to avoid Task's behavior of globbing even when quoted on Windows
+          # The odd method for escaping . in the regex is required for windows compatibility because mvdan.cc/sh gives
+          # \ characters special treatment on Windows in an attempt to support them as path separators.
+          for file in $(find . -regex ".*[.]md"); do
+            markdown-link-check \
+              --quiet \
+              --config "./.markdown-link-check.json" \
+              "$file"
+            STATUS=$(( $STATUS + $? ))
+          done
+          exit $STATUS
+        else
+          npx --package=markdown-link-check --call='
+            STATUS=0
+            for file in $(find . -regex ".*[.]md"); do
+              markdown-link-check \
+                --quiet \
+                --config "./.markdown-link-check.json" \
+                "$file"
+              STATUS=$(( $STATUS + $? ))
+            done
+            exit $STATUS
+          '
+        fi
 
   docs:check-formatting:
     desc: Check formatting of documentation files