[Docs] Update links in main README.md (#11284)

It looks like features.md was deprecated and content was split into other files. This results in a broken link on the main page which, if removed, would have no impact to the remainder of the documentation. This would also:
resolve #9239
resolve #10293 
resolve #10447

docs/README.md

@@ -24,7 +24,7 @@ Totally new to QMK? There are two ways to get started:
 
 ## Make It Yours
 
-QMK has lots of [features](features.md) to explore, and a good deal of reference documentation to dig through. Most features are taken advantage of by modifying your [keymap](keymap.md), and changing the [keycodes](keycodes.md).
+QMK has lots of features to explore, and a good deal of reference documentation to dig through. Most features are taken advantage of by modifying your [keymap](keymap.md), and changing the [keycodes](keycodes.md).
 
 ## Need help?