Update libclang setup to avoid slow starting sessions

+ Remove find from the LIBCLANG environment variable
+ Let the user run commands to set this variable up if needed, found in
the README

Change from echo to printf

.bash_aliases

@@ -32,4 +32,6 @@ fi
 eval "$(dircolors ~/.dir_colors)"
 export LS_COLORS="di=1;34:ln=31;47:so=32:pi=33:ex=1;32:bd=34;46:cd=34;43:su=30;41:sg=30;46:tw=30;42:ow=30;43"
 
+# Default libclang path for libclang-10-dev
+#export LIBCLANG="/usr/lib/llvm-10/lib/libclang.so.1"