Extend from tslint/recommended and remove duplicate rules

Would be nice if tslint-angular would extend from `tslint:recommended` and remove the duplicate rules.

Or.
- Remove the duplicate rules and add it as best practice to the readme?

```json
{
"extends": [
"tslint:recommended", // Should be extended before tslint-angular
"tslint-angular",
....
]
}
```

Start by locating the tslint-angular configuration entry point and README, then compare the configured rules with tslint:recommended. Done means the duplicate rules are removed and the chosen approach—extension or README guidance—is documented clearly.

Written by the indexing model from the issue text.