Revert "refactor: updated 11ty dependencies"

This reverts commit f9743ed.

Author: mfranzke

packages/docs/package.json

@@ -4,9 +4,9 @@
   "description": "The website for patternlab.io",
   "main": "index.js",
   "dependencies": {
-    "@11ty/eleventy": "^0.12.1",
-    "@11ty/eleventy-plugin-rss": "^1.1.2",
-    "@11ty/eleventy-plugin-syntaxhighlight": "^3.1.3",
+    "@11ty/eleventy": "^0.8.3",
+    "@11ty/eleventy-plugin-rss": "^1.0.6",
+    "@11ty/eleventy-plugin-syntaxhighlight": "^2.0.3",
     "@tbranyen/jsdom": "^13.0.0",
     "concurrently": "^4.1.0",
     "html-minifier": "^4.0.0",
@@ -18,7 +18,7 @@
     "stalfos": "github:hankchizljaw/stalfos#c8971d22726326cfc04089b2da4d51eeb1ebb0eb"
   },
   "devDependencies": {
-    "@11ty/eleventy-navigation": "^0.3.2",
+    "@11ty/eleventy-navigation": "^0.1.5",
     "@erquhart/rollup-plugin-node-builtins": "^2.1.5",
     "bl": "^3.0.0",
     "chokidar-cli": "^2.1.0",