docs: update package description and library documentation

- Update package description in pubspec.yaml
- Enhance library documentation in ht_email_repository.dart
- Remove unnecessary lines and improve code readability

Author: fulleni

lib/ht_email_repository.dart

@@ -1,4 +1,5 @@
-/// A Very Good Project created by Very Good CLI.
+/// A Dart package providing a repository layer for email operations
+/// within the Headlines Toolkit ecosystem.
 library;
 
 export 'src/ht_email_repository.dart';

pubspec.yaml

@@ -1,5 +1,5 @@
 name: ht_email_repository
-description: ...
+description: A Dart package providing a repository layer for email operations within the Headlines Toolkit ecosystem.
 repository: https://github.com/headlines-toolkit/ht-email-repository
 publish_to: none
 

test/src/ht_email_repository_test.dart

@@ -1,11 +1 @@
-// ignore_for_file: prefer_const_constructors
-import 'package:ht_email_repository/ht_email_repository.dart';
-import 'package:test/test.dart';
 
-void main() {
-  group('HtEmailRepository', () {
-    test('can be instantiated', () {
-      expect(HtEmailRepository(), isNotNull);
-    });
-  });
-}