fix warning for homepage build (#680)

* fix lex format for code

* fix doc links

* hide api reference

* delete orphan files

* fix deadlink in FAQ

* remove email address

* fix deadlinks for deleted orphan files

src/sdk/pynni/nni/networkmorphism_tuner/README.md

@@ -10,7 +10,7 @@ If you want to know about network morphism trial usage, please check [Readme.md]
 
 To use Network Morphism, you should modify the following spec in your `config.yml` file:
 
-```yml
+```yaml
 tuner:
   #choice: NetworkMorphism
   builtinTunerName: NetworkMorphism