docs(mkdocs): add updates for v0.1.28 features

docs/cli/border-style.md

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+# border-style
+
+```
+Set the border style
+
+Usage: komorebic.exe border-style <STYLE>
+
+Arguments:
+  <STYLE>
+          Desired border style
+
+          Possible values:
+          - system:  Use the system border style
+          - rounded: Use the Windows 11-style rounded borders
+          - square:  Use the Windows 10-style square borders
+
+Options:
+  -h, --help
+          Print help (see a summary with '-h')
+
+```