Build: shrink preview comment

Implement what we discussed in
#12295.
This is not perfect and it doesn't pretend to be, it's just one of the
implementations after a few discussion iterations in the comments.

The idea of this PR is to have something a little better than what we have to be
able to merge and move forward with.

Author: humitos

readthedocs/templates/core/build-overview.md

@@ -4,17 +4,15 @@ Template used for generating the build overview page that is posted as a comment
 Whitespaces and newlines are important in some places like lists and tables,
 make sure to adjust the tags accordingly, as they introduce newlines.
 {% endcomment %}
-## Documentation build overview
+### Documentation build overview
 
-> 📚 [{{ project.name }}](https://{{ PRODUCTION_DOMAIN }}{% url "projects_detail" project.slug %}) | 🛠️ build [#{{ current_version_build.pk }}](https://{{ PRODUCTION_DOMAIN }}{% url "builds_detail" project.slug current_version_build.pk %}) ({{ current_version_build.commit }}) | 🔍 [preview]({{ current_version.get_absolute_url }})
+> 📚 [{{ project.name }}](https://{{ PRODUCTION_DOMAIN }}{% url "projects_detail" project.slug %}) | 🛠️ Build [#{{ current_version_build.pk }}](https://{{ PRODUCTION_DOMAIN }}{% url "builds_detail" project.slug current_version_build.pk %}) | 📁 Comparing {{ current_version_build.commit }} against [{{ base_version.verbose_name }}]({{ base_version.get_absolute_url }}) ({{ base_version_build.commit }})
 
-### Files changed
-
-> Comparing with [{{ base_version.verbose_name }}]({{ base_version.get_absolute_url }}) ({{ base_version_build.commit }}...{{ current_version_build.commit }})
+[<kbd><br />🔍 Preview build <br /></kbd>]({{ current_version.get_absolute_url }})
 
 {% if diff.files %}
 <details>
-<summary>Show files ({{ diff.files|length }}) | {{ diff.modified|length }} modified | {{ diff.added|length }} added | {{ diff.deleted|length }} deleted</summary>
+<summary>Show files changed (({{ diff.files|length }} files total): 📝 {{ diff.modified|length }} | ➕ {{ diff.added|length }} | ➖ {{ diff.deleted|length }}</summary>
 
 | File | Status |
 | --- | --- |