Update Conpherence CSS to handle multiple edits better

Summary: Fixes T7655. We'll set tighter spacing around edit clusters. Also darkened up the date marker and remove unused `phabricator-transaction-view` CSS that was still scattered around the site.

Test Plan: Test a full and column multi-edit spam. Visited Ponder and Diffusion, noticed no issues using those apps. Grepped for other users of `phabricator-transaction-view`

Reviewers: epriestley, btrahan

Reviewed By: btrahan

Subscribers: Korvin, epriestley

Maniphest Tasks: T7655

Differential Revision: https://secure.phabricator.com/D12148

src/applications/diffusion/controller/DiffusionCommitController.php

@@ -720,8 +720,6 @@ final class DiffusionCommitController extends DiffusionController {
     $header->setHeader(
       $is_serious ? pht('Audit Commit') : pht('Creative Accounting'));
 
-    require_celerity_resource('phabricator-transaction-view-css');
-
     $mailable_source = new PhabricatorMetaMTAMailableDatasource();
     $auditor_source = new DiffusionAuditorDatasource();