PDF security features (#26)

- Support for adding and removing passwords
- Support for watermarks
- Dedicated page remover
- Support for PDF permissions
- Removed endpoint /home and replaced with /
- Code cleanups
- Fixed page titles

src/main/resources/templates/fragments/card.html

@@ -0,0 +1,9 @@
+<div th:fragment="card"  class="col-4 h-100">
+	<div class="dark-card card">
+		<div class="card-body">
+			<h5 class="card-title" th:text="${cardTitle}"></h5>
+			<p class="card-text" th:text="${cardText}"></p>
+			<a class="btn btn-primary" th:href="${cardLink}">Go</a>
+		</div>
+	</div>
+</div>