✨ feat: allow realtive paths in images

Useful when hosting on a subdirectory. Replaces $BASE_URL by the
base_url set in config.toml.

templates/macros/macros.html

@@ -74,7 +74,7 @@
         </section>
     </div>
     <div class="image-container-home">
-			<img alt="the owner" class="banner-home-img" src="{{ desc.img }}" />
+			<img alt="the owner" class="banner-home-img" src={{ desc.img | safe | replace(from="$BASE_URL", to=config.base_url) }} />
     </div>
 </div>
 {% endmacro page_desc %}

templates/shortcodes/invertable_image.html

@@ -1 +1 @@
-<img class="invertable-image" {% if src %}src="{{ src }}"{% endif %} {% if alt %}alt="{{ alt }}"{% endif %}/>
+<img class="invertable-image" {% if src %}src={{ src | safe | replace(from="$BASE_URL", to=config.base_url) }} {% endif %} {% if alt %}alt="{{ alt }}"{% endif %}/>