Organization.md has room for improvement

The [terminal](https://github.com/microsoft/terminal/tree/main)/[doc](https://github.com/microsoft/terminal/tree/main/doc)/ORGANIZATION.md
file doesn't speak about folders like .config .github etc which may be necessary for someone who is new to this repository.
Also it is a bit outdated like it talks about /src/host/tools but it doesn't exist currently.

Thus it can be worked upon and can be improved

Open doc/ORGANIZATION.md and compare its folder descriptions with the current repository tree, checking the referenced /src/host/tools path and the omitted .config and .github folders. Update the document so its structure is current and useful to newcomers; done means the listed folders and paths match the repository.

Written by the indexing model from the issue text.