Enhance the readability for README.md (#220)

* Enhance the README.md

* Enhance the index page

Author: Noah Hanjun Lee

README.md

@@ -1,27 +1,57 @@
 # Gitploy 
 
-![test](https://github.com/gitploy-io/gitploy/actions/workflows/test.yaml/badge.svg)
+![test](https://github.com/gitploy-io/gitploy/actions/workflows/test.yaml/badge.svg) ![build](https://github.com/gitploy-io/gitploy/actions/workflows/publish.yaml/badge.svg)
 
-![Gitploy](docs/images/gitploy.gif)
+<p align="center">
+  <img src="./docs/images/logo_400.png"><br/>
+  <b>Gitploy helps your team build the deployment system around GitHub in minutes.</b><br/>
+  <a href="https://docs.gitploy.io/">Documentation</a> | <a href="https://github.com/gitploy-io/gitploy/discussions">Community</a> | <a href="https://docs.gitploy.io/tasks/installation/">Installation Guide</a>
+</p>
+
+---
 
 ## What is Gitploy?
 
-Gitploy helps your team or organization builds the system around GitHub in minutes. Gitploy provides these features:
+GitHub provides [deployment API](https://docs.github.com/en/rest/reference/repos#deployments) to deploy a specific ref(branch, SHA, tag). It offers strong features to make your team (or organization) can deploy fast and safety. But it takes a lot of resources to build the tool with GitHub deployment API. 
+
+Gitploy makes your team or organization build the deployment system around GitHub in minutes. Now, do not waste the time to build the deployment system.
+
+![gitploy](./docs/images/gitploy.gif)
+
+
+## Features
+
+* Provides the intuitive UI to deploy a specific ref (branch, SHA, tag).
+* Build an event-driven deployment system around GitHub. See GitHub [deployment event](https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#deployment).
+* Integrate with GitHub [Action](https://github.com/features/actions) in minutes.
+* Provides deployment features: Rollback, Review, Lock.
+* Provides various validations for the deployment.
+* Provides DevOps metrics.
+
+## Gitploy vs GitHub environment
 
-* Deploy a specific ref (branch, commit, tag)
-* Build an event-driven deployment system around GitHub [deployment API](https://docs.github.com/en/rest/reference/repos#deployments)
-* Integrate with GitHub [Action](https://github.com/features/actions) in minutes
+Name        | Gitploy | GitHub environment
+---         |---      |---
+Manual deploy              | ✅ | ✅
+Review                     | ✅ | ✅
+Rollback                   | ✅ | ❌
+Lock environment           | ✅ | ❌
+Commit statuses validation | ✅ | ❌
+Display changed commmits   | ✅ | ❌
+Private repositories for teams plan | ✅ | ❌ (Enterprise Only)
 
-If you want to look around, you can check the [document](https://docs.gitploy.io) of Gitploy.
+## Getting Started
 
-## Docs and Support
+To install Gitploy on your hosting, read this [documentation](https://docs.gitploy.io/tasks/installation/). 
 
-The documentation to use Gitploy is available at: https://docs.gitploy.io
+For public repositories, we're providing the [free cloud](https://github.com/marketplace/gtiploy).
 
-For discussions and questions, post questions or comments to our [community](https://github.com/gitploy-io/gitploy/discussions). 
+### Important Links
 
-For bugs or errors, [open an issue](https://github.com/gitploy-io/gitploy/issues/new/choose) with details. 
+Documentation | Community | Installation Guide | Docker Image
+--- |--- |--- |---
+📚 [Documentation](https://docs.gitploy.io/) |💬 [Community](https://github.com/gitploy-io/gitploy/discussions) |📖 [Installation Guide](https://docs.gitploy.io/tasks/installation/) |🐋 [Docker Image](https://hub.docker.com/repository/docker/gitployio/gitploy)
 
-## Community 
+## Contributors
 
-You can visit us at Github [Discussions](https://github.com/gitploy-io/gitploy/discussions).
+TBD

docs/images/logo_400.png

@@ -1,14 +1,19 @@
 # Gitploy
 
-Gitploy helps your team or organization builds the system around GitHub in minutes. Gitploy provides these features:
+## What is Gitploy?
 
-* Deploy a specific ref (branch, commit, tag)
-* Build an event-driven deployment system around GitHub [deployment API](https://docs.github.com/en/rest/reference/repos#deployments)
-* Integrate with GitHub [Action](https://github.com/features/actions) in minutes
+GitHub provides [deployment API](https://docs.github.com/en/rest/reference/repos#deployments) to deploy a specific ref(branch, SHA, tag). It offers strong features to make your team (or organization) can deploy fast and safety. But it takes a lot of resources to build the tool with GitHub deployment API. 
 
-Try to build the deployment system with Gitploy ([doc](./tasks/installation.md)).
-
----
+Gitploy makes your team or organization build the deployment system around GitHub in minutes. Now, do not waste the time to build the deployment system.
 
 ![Gitploy](./images/gitploy.gif)
 
+## Features
+
+* Provides the intuitive UI to deploy a specific ref (branch, SHA, tag).
+* Build an event-driven deployment system around GitHub. See GitHub [deployment event](https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#deployment).
+* Integrate with GitHub [Action](https://github.com/features/actions) in minutes.
+* Provides deployment features: Rollback, Review, Lock.
+* Provides various validations for the deployment.
+* Provides DevOps metrics.
+