Plan to continue polish extension doc

[octref]

We would like to publish the revamped https://vscode-ext-docs.azurewebsites.net/api for November iteration.

Following the work we did at #1949, we continue to do the minimal amount of work to get the API extension out. After publishing, we would create a backlog of nice-to-have topics / enhancements and tackle them on an availability basis.

• Guide / Sample for using Commands Add a simple guide / sample for Commands #2189 @mjbvz
• 💪Color Theme Guide Write the color theme topic #2197 @Tyriar
• Preliminary Guide / Sample for writing a TextMate Grammar Add Syntax Highlight Guide / Sample #2188 @mjbvz
• Snippets Guide / Sample Review snippets guide / sample #2187 @octref
• Language Configuration Guide / Sample Fact-check and complete the language-configuration topic #2186 @rebornix
• Debugger Guide update Update debugger topic #2195 @weinand
• TreeView Guide update Issue with Tree View Guide #2194 @sandy081
• Find a good place for content in Principles and Patterns Find a good place for content in Principles and Patterns #2203 @kieferrm @jrieken

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Chores:

• Fix table auto-generation Fix table auto-generation #2210 @octref
• Update old links pointing to /docs/extensions and /docs/extensionAPI Update old links pointing to /docs/extensions and /docs/extensionAPI #2165 @octref
• Port /docs/extension* master changes to ext-doc branch topics Port docs/extensions and docs/extensionAPI commits to /api #2238 @gregvanl
• Change HelloCode back to HelloWorld Use convention "Hello World" for name of first extension #2144 @octref

Assignees: Please start early so your reviewers have time to provide feedback.

We'll continue to address feedback for the existing documentation, but there is no plan item for them. If you do have feedback for our Preview API Doc, please open new issues and ping me.

Deferred

• 🏃Split LSP Guide into Smart Editing Guide and Smart Editing LSP Guide Split LSP Guide into Smart Editing Guide and Smart Editing LSP Guide #2209 @octref
• 💪Add ability to click-to-maximize pictures Docs suggestion - add ability to maximize pictures #2162 @octref

[octref]

Shipped.