docs(readme): fix broken template scaffold command

[immanuwell]

Fixes a broken wash new command in templates/http-hello-world-fetch/README.md.
Right now it points at templates/http-hello-world, but that folder is not in this repo, so copy paste hits a wall.

Also syncs the root, template, and example README lists with the dirs that are actually shipped here. they were a bit out of date too.

Repro

1. Open templates/http-hello-world-fetch/README.md
2. Run wash new https://github.com/wasmCloud/typescript.git --name http-hello-world --subfolder templates/http-hello-world
3. It fails because that subfolder does not exist

Fix
Use templates/http-hello-world-fetch in the command and update the stale README indexes.

[ericgregory]

Thanks @immanuwell!