new doc (easegress-io#1086)

* add structure for new doc

* update

* update file name

* udpate doc for getting started

* udpate doc for tutorials

* udpate doc for tutorials

* update doc for tutorials, cookbook and reference

* fix grpcserver doc in reference

* finish grpc doc in tutorial

* update docs cookbook part

* update doc cloud native part

* update doc administration part

* update doc development part

* update reference, optim doc

* update readme

* rm previous documentation

* Update docs/04.Cloud-Native/4.1.Kubernetes-Ingress-Controller.md

Co-authored-by: Loki's Wager <[email protected]>

* Update docs/04.Cloud-Native/4.1.Kubernetes-Ingress-Controller.md

Co-authored-by: Loki's Wager <[email protected]>

* Update docs/04.Cloud-Native/4.1.Kubernetes-Ingress-Controller.md

Co-authored-by: Loki's Wager <[email protected]>

* Update docs/04.Cloud-Native/4.1.Kubernetes-Ingress-Controller.md

Co-authored-by: Loki's Wager <[email protected]>

* udpate docs based on comments

* update doc

---------

Co-authored-by: Loki's Wager <[email protected]>

CONTRIBUTING.md

@@ -1,13 +1,12 @@
-# Contributing
+# Contributing <!-- omit from toc -->
 
 Welcome to the Easegress contributing guide. Are you looking for help or a way to create bug tickets or discuss new potential features? Perhaps you want to fix a typo in the documentation or are you interested in getting involved in the project? You can find answers to these questions and how to contribute to Easegress in this document.
 
+- [Getting help](#getting-help)
+- [Feature requests](#feature-requests)
+- [Reporting general issues](#reporting-general-issues)
 - [Contributing](#contributing)
- - [Getting help](#getting-help)
- - [Feature requests](#feature-requests)
- - [Reporting general issues](#reporting-general-issues)
- - [Contributing](#contributing-1)
- - [Pull request guide](#pull-request-guide)
+- [Pull request guide](#pull-request-guide)
 
 ## Getting help