Improve code quality & consistency

* Add EditorConfig
* Rebuild animate.css: remove an unused animation
* Slightly rewrite header part

.editorconfig

@@ -0,0 +1,20 @@
+# editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{html,xml}]
+indent_style = tab
+
+[*.md]
+indent_style = unset
+indent_size = unset
+insert_final_newline = unset
+trim_trailing_whitespace = unset