[FIX] *: enforce 1 newline on files end

Part-of: odoo/documentation#2984

extensions/odoo_theme/layout_templates/changelog.html

@@ -27,4 +27,4 @@
             </div>
         </div>
     </div>
-</section>
+</section>

extensions/odoo_theme/layout_templates/menu.html

@@ -9,4 +9,4 @@
     `collapse_menu` is passed directly to Jinja with sphinx-build's option `-A collapse_menu=True`.
     It it evaluated as a string, so what we're really evaluating here is `collapse_menu != None`.
 #}
-{{ toctree(collapse=collapse_menu, titles_only=True, includehidden=False)}}
+{{ toctree(collapse=collapse_menu, titles_only=True, includehidden=False)}}

extensions/odoo_theme/static/scss/bootstrap_overridden.scss

@@ -40,4 +40,3 @@ $accordion-button-bg:                       $accordion-bg !default;
 $accordion-button-active-bg:                $accordion-button-bg !default;
 
 $accordion-icon-transform:                  rotate(0deg) !default;
-