Searching, url indexing

* Added a help page
* Cleaned up home and login pages
* Menu is hidden when on notes section of app
* Added username to login data
* Notes now change to the color selected for the note
* Note save function has a 500ms debounce to prevent spamming
* Solr results now displays content from notes, tags and attachments
* All note data is now indexed in solr
* Notes containing URLs are now scraped and put into tag solr index
* Attachments that are removed from note are deleted when url is removed
* Minor little tweaks and fixes all over the place

package.json

@@ -10,7 +10,8 @@
   "license": "ISC",
   "dependencies": {
     "body-parser": "^1.18.3",
-    "express": "^4.16.4"
+    "express": "^4.16.4",
+    "request-promise": "^4.2.4"
   },
   "_moduleAliases": {
     "@root": ".",