update Makefiles and symlinks

examples/smtp-client/README.md

@@ -1,5 +1,2 @@
-# SMTP client example
-
-This example shows how to send emails using Mongoose.
-Before running this example, open main.c and modify settings at the top
-of the file.
+- This example requires changing server name and user credentials on `main.c`
+- This example requires building with TLS support; before running, see detailed tutorial at https://mongoose.ws/tutorials/smtp-client/