use default base names

book.json

@@ -1,6 +1,5 @@
 {
     "structure": {
-        "readme": "home.md",
         "summary": "_summary.md"
     },
     "plugins" : ["toolbar", "edit-link", "anchors"],

docs/_summary.md

@@ -1,5 +1,4 @@
-* Getting started 
-  * [Introduction](home.md)
+* [Getting started](README.md) 
   * [QMK Overview](qmk_overview.md)
   * [Build Environment Setup](build_environment_setup.md)
   * [Make instructions](make_instructions.md)