💥 feat!: add tag filtering for projects (#431)

- Card (project) images no longer require manual top/bottom margin
adjustments for proper spacing. Action needed: Review existing card
images as previous manual margin adjustments may now be
unnecessary/excessive.
- Sites using `cards.html` with tags will now load JavaScript by
default when tags are present. To maintain no-JS behaviour, explicitly
set `enable_cards_tag_filtering = false` in either `config.toml` or the
`_index.md` file where `cards.html` is used.

templates/macros/list_posts.html

@@ -92,6 +92,25 @@
                         {%- endif -%}
                     {%- endif -%}
 
+                    {% if post.extra.local_image or post.extra.remote_image %}
+                        <li class="post-thumbnail">
+                            <a href="{{ post.permalink }}">
+                                {% if post.extra.local_image %}
+                                    {% set meta = get_image_metadata(path=post.extra.local_image, allow_missing=true) %}
+                                    <img class="thumbnail-image"
+                                        alt="{{ post.extra.local_image }}"
+                                        src="{{ get_url(path=post.extra.local_image) }}"
+                                        {% if meta.width %}width="{{ meta.width }}"{% endif %}
+                                        {% if meta.height %}height="{{ meta.height }}"{% endif %}>
+                                {% elif post.extra.remote_image %}
+                                    <img class="thumbnail-image"
+                                        alt="{{ post.extra.remote_image }}"
+                                        src="{{ post.extra.remote_image }}">
+                                {% endif %}
+                            </a>
+                        </li>
+                    {% endif %}
+
                     {% if post.draft %}
                         <li class="draft-label">{{ macros_translate::translate(key="draft", default="DRAFT", language_strings=language_strings) }}</li>
                     {% endif %}