The great refactor (#82)

source/plugins/lines/README.md

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+### 👨‍💻 Lines of code changed
+
+The *lines* of code plugin displays the number of lines of code you have added and removed across all of your repositories.
+
+<table>
+  <td align="center">
+    <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.lines.svg">
+    <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_lines: yes
+```