Bugfix: Dashboard - Difficulty adjustment component. (#663)

* Add color to previous retarget.
Add absolute number pipe.
Change plus and minus signs to fa icons.
Change Fee Estimate title to Transactions Fees.
Set min and max difficulty adjustments.

* Add projectID to cypress conf.

* Change icon to fa-caret.

* Remove unecessary icons.

frontend/cypress.json

@@ -1,4 +1,5 @@
 {
+  "projectId": "ry4br7",
   "integrationFolder": "cypress/integration",
   "supportFile": "cypress/support/index.ts",
   "videosFolder": "cypress/videos",