gulp tasks and nunjucks templating

- reworked nearly all gulp tasks
- added html templating with nunjucks
- replaced some old html files
- started correction of scss and js files according to lint results

bower.json

@@ -0,0 +1,23 @@
+{
+  "name": "hippie",
+  "description": "Hippie interweaves preeminent personal interface elements",
+  "main": "gulpfile.js",
+  "authors": [
+    "Interaktionsweise"
+  ],
+  "license": "ISC",
+  "homepage": "https://github.com/sthag/hippie",
+  "private": true,
+  "ignore": [
+    "**/.*",
+    "node_modules",
+    "bower_components",
+    "build/bower_components",
+    "test",
+    "tests"
+  ],
+  "dependencies": {
+    "jquery": "^3.2.1",
+    "normalize-css": "^7.0.0"
+  }
+}