More cleanup after move to pnpm (#1350)

- Remove some more unnecessary files
- Update README for docs site

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

.vscodeignore

@@ -1,41 +1,31 @@
-# Website
+# cursorless.org docs site
+
+This is the source code for the [cursorless.org/docs](https://cursorless.org/docs) portion of the Cursorless website. Note that it is built independently from the rest of the site (which uses Next.js, and can be found in the [`cursorless-org`](../packages/cursorless-org) directory).
 
 This website is built using [Docusaurus 2](https://docusaurus.io/), a modern static website generator.
 
 ### Installation
 
 ```
-$ yarn
+pnpm install
 ```
 
 ### Local Development
 
 ```
-$ yarn start
+pnpm start
 ```
 
 This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
 
 ### Build
 
 ```
-$ yarn build
+pnpm build
 ```
 
 This command generates static content into the `build` directory and can be served using any static contents hosting service.
 
-### Deployment
-
-Using SSH:
-
-```
-$ USE_SSH=true yarn deploy
-```
-
-Not using SSH:
-
-```
-$ GIT_USER=<Your GitHub username> yarn deploy
-```
+### Deploy
 
-If you are using GitHub pages for hosting, this command is a convenient way to build the website and push to the `gh-pages` branch.
+After building this site, we copy the output to the `docs` subdir of the staging directory for our website, which is then deployed by Netlify. See the [deploy script](../../scripts/build-and-assemble-website.sh) for more details.