fix(branding): Update references from 'CROssBAR' to 'CROssBARv2' in About and Home

Author: mert-ergun

crossbar_llm/frontend/src/components/About.js

@@ -325,7 +325,7 @@ function About({ onClose }) {
             rel="noopener"
             sx={{ borderRadius: '10px' }}
           >
-            CROssBAR Website
+            CROssBARv2 Website
           </Button>
 
           <Button 

crossbar_llm/frontend/src/components/Home.js

@@ -655,7 +655,7 @@ RETURN p`,
                       Knowledge Graph
                     </Typography>
                     <Typography variant="body2" sx={{ color: 'text.secondary', textAlign: 'center' }}>
-                      Access comprehensive biomedical data from the CROssBAR knowledge graph
+                      Access comprehensive biomedical data from the CROssBARv2 knowledge graph
                     </Typography>
                   </Paper>
                 </Button>