Updating with new links and correct branding

Author: iriark01

DOXYGEN_FRONTPAGE.md

@@ -1,8 +1,5 @@
-# mbed OS code base
+# Mbed OS code base
 
-This is the code documentation for mbed OS.
+This is the code documentation for Mbed OS.
 
-For more information, please see:
-
-* [The mbed OS API References](https://docs.mbed.com/docs/mbed-os-api-reference/)
-* [The mbed OS Handbook](https://docs.mbed.com/docs/mbed-os-handbook/)
+For more information, please see [the Mbed OS API references](https://os.mbed.com/docs/mbed-os/latest/apis/index.html) and [the full list of tutorials and examples](https://os.mbed.com/docs/mbed-os/latest/tutorials/index.html).