Don't check ERB Lint ErbSafety in files using raw

We're excluding these files because they use `raw` to render content
than only administrators can edit, and we trust administrators not to
provide unsafe HTML. We should definitely sanitize them at some point
but, at the same time, we should also try to keep compatibility in
installations taking advantage of `raw`.

Also note that ERB Lint does not allow customizing the severity of a
linter; if it ever does, we'll use the severity rule instead of
excluding files.

.erb-lint.yml

@@ -9,6 +9,16 @@ linters:
     enabled: true
   ErbSafety:
     enabled: true
+    exclude:
+      - app/components/budgets/investments/content_blocks_component.html.erb
+      - app/components/layout/footer_component.html.erb
+      - app/components/layout/social_component.html.erb
+      - app/components/layout/subnavigation_component.html.erb
+      - app/components/layout/top_links_component.html.erb
+      - app/views/admin/site_customization/content_blocks/index.html.erb
+      - app/views/layouts/application.html.erb
+      - app/views/layouts/dashboard.html.erb
+      - app/views/layouts/devise.html.erb
   ExtraNewline:
     enabled: true
   FinalNewline: