fix: disable MD060 rule in helm-docs default markdownlint config

MD060 (table-column-style) conflicts with Prettier's table formatting
and cannot be auto-fixed. This rule requires aligned table pipes,
but Prettier removes alignment padding when formatting markdown.

Co-authored-by: neilime <314088+neilime@users.noreply.github.com>

Author: Copilot

actions/helm/generate-docs/action.yml

@@ -115,6 +115,9 @@ runs:
             const defaultConfig = {
               "default": true,
               "line-length": false,
+              // Disable MD060 because Prettier formats tables without aligned pipes,
+              // and markdownlint cannot auto-fix this rule
+              "MD060": false,
               "outputFormatters": [
                 [
                   "markdownlint-cli2-formatter-template",