build(deps): bump postcss from 7.0.35 to 7.0.39

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.35 to 7.0.39.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/7.0.39/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.35...7.0.39)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -62,7 +62,7 @@
     "markdownlint-cli": "^0.27.1",
     "merge": "^2.1.1",
     "minify": "^7.0.1",
-    "node-sass": "^7.0.0",
+    "node-sass": "^5.0.0",
     "prettier": "^2.2.1",
     "stylelint": "^13.12.0",
     "stylelint-a11y": "^1.2.3",

renovate.json

@@ -1,6 +0,0 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:base"
-  ]
-}