[Feat]: use node-prune to remove all unnecessary files from the distribution

## What is your suggestion?

Currently in the code-server distribution archives there are over 56000 files, most of them are:
- READMEs
- CHANGELOGs
- LICENSEs
- TypeScript files
- C sources and headers
- Linter configs
- and so on...

I propose to use [node-prune](https://github.com/tj/node-prune) when building code-server to get rid of all unnecessary files.

## Why do you want this feature?

To slim down the distribution size and for cleaneleness.