Make Onboarding/Cross-Platform Development Smoother

[DanielRosenwasser]

When @RyanCavanaugh and I spoke to @navya9singh recently about the onboarding process for the site, there were a few issues when building on other platforms, and even once she got things working with a codespace, the repo was having a few build issues based on newly constructed artifacts.

So some things that we should think about:

• how do we ensure the site doesn't have too many environment-specific expectations to build?
• the contents of the site update dynamically based on external data sources - how do we differentiate between an intentional update of the site vs. an automated update? How much manual intervention should we expect from these things? How do we avoid forgetting steps?

[orta]

The site validates that you can bootstrap and build on Windows on CI with every commit - open to looking at specific cases where things aren't working, but this has been pretty useful with external contributors who use Window before

WRT assets on release updates, that's a good question - I wanted to always know exactly what changed when I was actively working on this but I think there's probably a few files which can be put into the gitignore. The full docs for upgrading the version are here: https://github.com/microsoft/TypeScript-Website/blob/v2/docs/New%20TypeScript%20Version.md

[redradist]

Please, also consider adding official support for deno.
Deno currently supports npm packages and it should be very easy to do

[typescript-bot]

Hello! As per #2804, we are automatically closing all open issues. Please see #2804 for a description of what issues and PRs can be accepted going forward.