v0.3.0 extension changes

[0hsn]

• icon for commands vscode extension
• disable run command instead of hidden in extension
• add filetype association extension

https://code.visualstudio.com/api/extension-guides/command
https://code.visualstudio.com/api/references/contribution-points#contributes.configuration
https://code.visualstudio.com/docs/getstarted/settings
https://code.visualstudio.com/docs/languages/overview#_changing-the-language-for-the-selected-file
https://code.visualstudio.com/docs/languages/identifiers
https://code.visualstudio.com/api/references/activation-events

• change doc website URL in extension

[arifszn]

Assuming add filetype association extension implicating something like that:

"activationEvents": [
    "onLanguage:chkware"
]