The great refactor (#82)

source/plugins/isocalendar/README.md

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+### 📅 Isometric commit calendar
+
+The *isocalendar* plugin displays an isometric view of your commits calendar, along with a few additional stats like current streak and commit average per day.
+
+<table>
+  <td align="center">
+    <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.isocalendar.svg">
+    <details><summary>Full year version</summary>
+      <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.isocalendar.fullyear.svg">
+    </details>
+    <img width="900" height="1" alt="">
+  </td>
+</table>
+
+#### ℹ️ Examples workflows
+
+[➡️ Available options for this plugin](metadata.yml)
+
+```yaml
+- uses: lowlighter/metrics@latest
+  with:
+    # ... other options
+    plugin_isocalendar: yes
+    plugin_isocalendar_duration: full-year # Display full year instead of half year
+```