updated file name of angular cli config file (valor-software#4556)

Since angular v6 the cli config file has changed. This commit fixes this filename change
See https://stackoverflow.com/a/43832022/570009

docs/getting-started/bootstrap.md

@@ -28,8 +28,8 @@ ng serve
 
 Now that the project is set up it must be configured to include the Bootstrap CSS. You have two options:
 
- - add styles to .angular-cli.json:
-   - Open the file .angular-cli.json from the root of your project.
+ - add styles to angular.json:
+   - Open the file angular.json from the root of your project.
    - Under the property apps the first item in that array is the default application.
    - There is a property styles which allows external global styles to be applied to your application.
 
@@ -43,7 +43,7 @@ Now that the project is set up it must be configured to include the Bootstrap CS
    ],
    ```
 
-   Note: When you make changes to .angular-cli.json you will need to re-start ng serve to pick up configuration changes.
+   Note: When you make changes to angular.json you will need to re-start ng serve to pick up configuration changes.
 
  - add styles to index.html:
    - for Bootstrap 3:
@@ -71,7 +71,7 @@ cd my-app
 If the project has already been created then
 
 - rename `src/styles.css` to `src/styles.scss`
-- in `.angular-cli.json` make the following changes
+- in `angular.json` make the following changes
 ```
 "styles": [
   "styles.css" <-- rename this from .css to .scss