significant expansion of scss styling, incl. new _dashboard.scss sheet & comprehensive primary btn theme synced w. user palette; changes to all other scss files; list.html & base.html retrofitted w. corresponding scss classes

src/templates/apps/dashboard/list.html

@@ -41,7 +41,7 @@
                     </div>
                 {% endif %}
 
-                <button type="submit" class="btn btn-primary">Share</button>
+                <button type="submit" class="btn btn-primary btn-xl">Share</button>
             </form>
             <small>List shared with:
                 {% for user in list.shared_with.all %}