Add private or dev network setup docs

Guides and config templates for use in setting up private
Veilid networks for independent or development needs.

doc/config/veilid-dev-bootstrap-config

@@ -3,6 +3,11 @@
 #
 # Private Development Bootstrap Server Configuration
 #
+# This config is templated to setup a bootstrap server with
+# a network_key_password. Set the network key to whatever you
+# like. Treat it like a password. Use the same network key in
+# the config files for at least four nodes to establish an
+# independent Veilid network for private or development uses.
 # -----------------------------------------------------------
 
 ---

doc/config/veilid-dev-node-config

@@ -1,8 +1,12 @@
 # Veilid Server
 # =============
 #
-# Dev Node Configuration
+# Private Development Node Configuration
 #
+# This config is templated to setup a Velid node with a 
+# network_key_password. Set the network key to whatever you
+# set within your private bootstrap server's config. Treat it 
+# like a password. 
 # -----------------------------------------------------------
 
 ---