Review Che Theia End-User Guide

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We need to review Che Theia End-User Guide:

2. Che-Theia IDE basics
  2.1. Defining custom commands for Che-Theia
    2.1.1. Che-Theia task types
    2.1.2. Running and debugging
    2.1.3. Editing a task and launch configuration
  2.2. Version Control
    2.2.1. Managing Git configuration: identity
    2.2.2. Accessing a Git repository using HTTPS
    2.2.3. Accessing a Git repository using a generated SSH key pair
    2.2.4. Managing pull requests using the GitHub PR plug-in
  2.3. Che-Theia Troubleshooting
4. Customizing developer environments
  4.1. What is a Che-Theia plug-in
    4.1.1. Features and benefits of Che-Theia plug-ins
    4.1.2. Che-Theia plug-in concept in detail
    4.1.3. Che-Theia plug-in metadata
    4.1.4. Che-Theia plug-in lifecycle
    4.1.5. Embedded and remote Che-Theia plug-ins
    4.1.6. Remote plug-in endpoint
  4.2. Using alternative IDEs in CodeReady Workspaces
  4.3. Adding tools to CodeReady Workspaces after creating a workspace
    4.3.1. Additional tools in the CodeReady Workspaces workspace
    4.3.2. Adding language support plug-in to the CodeReady Workspaces workspace    

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