feat: Integrate gitingest for GitHub repository ingestion

- Added gitingest as a dependency to streamline the ingestion of GitHub repositories.
- Refactored GitHubConnector to utilize gitingest for efficient repository digest generation, reducing API calls.
- Updated GitHub indexer to process entire repository digests, enhancing performance and simplifying the indexing process.
- Modified GitHub connect form to indicate that the Personal Access Token is optional for public repositories.

surfsense_web/components/new-chat/source-detail-panel.tsx

@@ -490,8 +490,8 @@ export function SourceDetailPanel({
 														>
 															{idx + 1}
 															{isCited && (
-																<span className="absolute -top-1 -right-1 w-3 h-3 bg-primary rounded-full border-2 border-background">
-																	<Sparkles className="h-2 w-2 text-primary-foreground absolute top-0.5 left-0.5" />
+																<span className="absolute -top-1.5 -right-1.5 flex items-center justify-center w-4 h-4 bg-primary rounded-full border-2 border-background shadow-sm">
+																	<Sparkles className="h-2.5 w-2.5 text-primary-foreground" />
 																</span>
 															)}
 														</motion.button>