Tada68: Updated links to external sites. (#3389)

Friend was having trouble with their tada since their build environment wasn’t setup.  Updated so they could access the links that were listed (old links 404’d)

keyboards/tada68/readme.md

@@ -11,7 +11,7 @@ Make example for this keyboard (after setting up your build environment):
 
     make tada68:default:bin
 
-See [build environment setup](https://docs.qmk.fm/build_environment_setup.html) then the [make instructions](https://docs.qmk.fm/make_instructions.html) for more information.
+See [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) then the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information.
 
 ## Flashing Instructions