Remove old, big warning about Khoj not configured on server init

- Just say using default config. This old khoj.yml settings mechamism
  isn't standard, so not having a configured khoj.yml isn't a concern
- Deep link to desktop download instead of the whole download page as
  android etc. are also on it, which don't help with syncing docs

src/khoj/configure.py

@@ -228,7 +228,7 @@ def configure_server(
 ):
     # Update Config
     if config == None:
-        logger.info(f"🚨 Khoj is not configured.\nInitializing it with a default config.")
+        logger.info(f"Initializing with default config.")
         config = FullConfig()
     state.config = config
 

src/khoj/processor/conversation/prompts.py

@@ -74,7 +74,7 @@ no_online_results_found = PromptTemplate.from_template(
 
 no_entries_found = PromptTemplate.from_template(
     """
-    It looks like you haven't added any notes yet. No worries, you can fix that by downloading the Khoj app from <a href=https://khoj.dev/downloads>here</a>.
+    It looks like you haven't synced any notes yet. No worries, you can fix that by downloading the Khoj app from <a href=https://khoj.dev/downloads#desktop>here</a>.
 """.strip()
 )