Remove all proposal-related code

We're not using proposals at the moment, so it's just in the way.

app/controllers/dashboard.js

@@ -45,12 +45,6 @@ export default Controller.extend({
       });
     },
 
-    confirmProposal (proposalId) {
-      this.kredits.vote(proposalId).then(transaction => {
-        console.debug('[controllers:index] Vote submitted to Ethereum blockhain: '+transaction.hash);
-      });
-    },
-
     toggleQuickFilterUnconfirmed () {
       this.toggleProperty('showQuickFilterUnconfirmed');
     },

app/controllers/proposals/new.js

@@ -1,24 +0,0 @@
-import Controller from '@ember/controller';
-import { alias, filterBy } from '@ember/object/computed';
-import { inject as service } from '@ember/service';
-
-export default Controller.extend({
-  kredits: service(),
-
-  contributors: alias('kredits.contributors'),
-  minedContributors: filterBy('contributors', 'id'),
-
-  actions: {
-    save(proposal) {
-      // contributorIpfsHash is needed for the proposal ipfs data. I'm not happy to do this here but I think to load all the contributors in addProposal again is a bit too much. I hope we can refactor it later.
-      let contributor = this.contributors.findBy('id', proposal.contributorId);
-      proposal.contributorIpfsHash = contributor.get('ipfsHash');
-
-      return this.kredits.addProposal(proposal)
-        .then((proposal) => {
-          this.transitionToRoute('index');
-          return proposal;
-        });
-    }
-  }
-});