feat: Classify nodes based on edge relationships #162 (#1755)

### What problem does this PR solve?
feat: Add ForceGraph
feat: Classify nodes based on edge relationships #162 

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/add-knowledge/components/knowledge-chunk/index.tsx

@@ -182,15 +182,14 @@ const Chunk = () => {
               />
             </div>
           </Flex>
-
-          {
+          {isPdf && (
             <section className={styles.documentPreview}>
               <DocumentPreview
                 highlights={highlights}
                 setWidthAndHeight={setWidthAndHeight}
               ></DocumentPreview>
             </section>
-          }
+          )}
         </Flex>
       </div>
       {chunkUpdatingVisible && (