Repository: create-react-app
Issue: CRA --template not picking up github url from a nested folder.
Labels: issue: bug report

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### Describe the bug

I am trying to init a `create-react-app` with a github url

```
npx create-react-app my-app --use-npm --template git+ssh://git@github.com/<orgname>/<repo>.git/<folder-name>/react-scripts/cra-template-javascript

```

The issue is my github repo has multiple templates, I can run them locally like

```
npx create-react-app my-app --use-npm --template file:/Users/adeelimran/Desktop/adeel/repos/sandbox/adeel_imran/react-scripts/cra-template-typescript
```

But I can run it via the github link, because the project folder is under a nested github folder.

### Did you try recovering your dependencies?

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This issue does not have dependencies.

### Which terms did you search for in User Guide?

https://create-react-app.dev/docs/custom-templates

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### Environment

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```
Environment Info:

  current version of create-react-app: 3.4.1
  running from /Users/adeelimran/.npm/_npx/45395/lib/node_modules/create-react-app

  System:
    OS: macOS 10.15.5
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
  Binaries:
    Node: 14.4.0 - ~/.nvm/versions/node/v14.4.0/bin/node
    Yarn: 1.22.4 - ~/.yarn/bin/yarn
    npm: 6.14.5 - ~/.nvm/versions/node/v14.4.0/bin/npm
  Browsers:
    Chrome: 83.0.4103.106
    Firefox: 64.0.2
    Safari: 13.1.1
  npmPackages:
    react: Not Found
    react-dom: Not Found
    react-scripts: Not Found
  npmGlobalPackages:
    create-react-app: Not Found
```

### Steps to reproduce

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(Write your steps here:)

1. Create a github repo
2. Inside that repo create some nested folders
3. In one of the templates add the content as is from here https://github.com/facebook/create-react-app/tree/master/packages/cra-template
4. On executing `npx create-react-app my-app --use-npm --template git+ssh://git@github.com/<username>/<repo-name>.git/folder1/fodler2/cra-template-javascript
`
5. It should find this folder & init a CRA project using the given template

### Expected behavior

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It should create the project reading from the github url.

### Actual behavior

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<img width="978" alt="Screenshot 2020-06-24 at 15 28 27" src="https://user-images.githubusercontent.com/16651811/85565509-7de37c00-b62f-11ea-8513-2311ce4cdb53.png">

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