feat: Update getDocument method in KsDocumentController

Refactor the getDocument method in KsDocumentController to return a single KSDocument object instead of a list. This improves the efficiency and readability of the code. The method now uses the findById method of ksDocumentRepository to retrieve the document with the specified id.

pom.xml

@@ -90,6 +90,14 @@
 			<artifactId>lombok</artifactId>
 			<version>1.18.34</version>
 		</dependency>
+
+
+		<dependency>
+			<groupId>org.eclipse.jgit</groupId>
+			<artifactId>org.eclipse.jgit</artifactId>
+			<version>6.8.0.202311291450-r</version>
+		  </dependency>
+
  	</dependencies>
 
 	<build>
@@ -133,6 +141,10 @@
 			<enabled>false</enabled>
 		</releases>
 		</repository>
+		<repository>
+			<id>jgit-repository</id>
+			<url>https://repo.eclipse.org/content/groups/releases/</url>
+		  </repository>
 	</repositories>
 	<pluginRepositories>
 		<pluginRepository>