feat: warning for protected note without protection

- Use `.sn-button` everywhere
- Delete permissions modal
- Capitalize "Clear session data"

app/assets/templates/directives/password-wizard.pug

@@ -41,8 +41,7 @@
                 | Please ensure you are running the latest version of Standard Notes
                 | on all platforms to ensure maximum compatibility.
           .sk-panel-footer
-            .sk-button.info(
+            button.sn-button.info(
               ng-click='ctrl.nextStep()',
               ng-disabled='ctrl.state.lockContinue'
-              )
-              .sk-label {{ctrl.state.continueTitle}}
+            ) {{ctrl.state.continueTitle}}