fix(search): avoid missing spaces between paragraphs in search results (#2199)

- Use a common post-snippet for search results to avoid line break issues
- Reduce Jekyll include files to speed up the build
- Remove outdated key from search.json

assets/js/data/search.json

@@ -5,16 +5,16 @@ swcache: true
 
 [
   {% for post in site.posts %}
+    {%- capture description -%}
+      {% include post-description.html %}
+    {%- endcapture -%}
   {
     "title": {{ post.title | jsonify }},
     "url": {{ post.url | relative_url | jsonify }},
     "categories": {{ post.categories | join: ', ' | jsonify }},
     "tags": {{ post.tags | join: ', ' | jsonify }},
     "date": "{{ post.date }}",
-    {% include no-linenos.html content=post.content %}
-    {% assign _content = content | strip_html | strip_newlines %}
-    "snippet": {{ _content | truncate: 200 | jsonify }},
-    "content": {{ _content | jsonify }}
+    "content": "{{ description }}"
   }{% unless forloop.last %},{% endunless %}
   {% endfor %}
 ]