Update dashboard and template flow (#514)

* Updated header and footer
* Moved files around and updated gulpfile to correct the build process when it goes to production
* Updated fonts
* Adjusted grid templating
* Adding images to assets
* Updated account pages, dashboard, and pages in message sending flow
* Updated the styling for the landing pages in the account section once logged in

tests/app/main/views/test_email_branding.py

@@ -26,7 +26,7 @@ def test_email_branding_page_shows_full_branding_list(
         page.select_one('h1').text
     ) == "Email branding"
 
-    assert page.select('.govuk-grid-column-three-quarters a')[-1]['href'] == url_for('main.create_email_branding')
+    assert page.select('.grid-col-10 a')[-1]['href'] == url_for('main.create_email_branding')
 
     assert brand_names == [
         'org 1',
@@ -142,7 +142,7 @@ def test_create_email_branding_requires_a_name_when_submitting_logo_details(
         _expected_status=200,
     )
 
-    assert page.select_one('.govuk-error-message').text.strip() == 'Error: This field is required'
+    assert page.select_one('.usa-error-message').text.strip() == 'Error: This field is required'
     assert mock_create_email_branding.called is False