docs: harmonize the indentation of the README, and tweak some wordings

README

 
-	GNU nano - an enhanced clone of the Pico text editor.
+		GNU nano -- an enhanced clone of the Pico text editor
 
 Overview
 
@@ -24,7 +24,7 @@ How to compile and install nano
 
 	Download the nano source code, then:
 
-     tar zxvf nano-x.y.z.tar.gz
+	tar xvzf nano-x.y.z.tar.gz
 	cd nano-x.y.z
 	./configure
 	make
@@ -33,38 +33,35 @@ How to compile and install nano
 	It's that simple.  Use --prefix with configure to override the
 	default installation directory of /usr/local.
 
-     If you haven't configured with the "--disable-nanorc" option, after
-     installation you may want to copy the doc/nanorc.sample to your
-     home directory, rename it to ".nanorc", and then edit it according
-     to your taste.
+	If you haven't configured with the --disable-nanorc option, after
+	installation you may want to copy the doc/nanorc.sample file to
+	your home directory, rename it to ".nanorc", and then edit it
+	according to your taste.
 
 Web Page
 
 	https://nano-editor.org/
 
-Mailing Lists and Bug Reports
+Mailing Lists
 
-	Savannah hosts all the nano-related mailing-lists.
+	There are three nano-related mailing-lists.
 
 	+ info-nano@gnu.org is a very low traffic list used to announce
-	  new nano versions or other important information about the
-	  project.
+	  new nano versions or other important info about the project.
 	+ help-nano@gnu.org is for those seeking to get help without
 	  wanting to hear about the technical details of its development.
-	+ nano-devel@gnu.org is the list used by the people that make
-	  nano and a general development discussion list, with moderate
-	  traffic.
-
-	To subscribe, send email to <name>-request@gnu.org with a
-	subject of "subscribe", where <name> is the list you want to
-	subscribe to.
-
-	For general bug reports, please file a description of the problem
-	on the Savannah bug tracker page for nano
-	(https://savannah.gnu.org/bugs/?group=nano).  The issue may have
-	already been reported, and we are better able to track the state
-	of the issue and whom to notify when fixed, the more the bug
-	tracker is used.
+	+ nano-devel@gnu.org is the list used by the people that make nano
+	  and a general development discussion list, with moderate traffic.
+
+	To subscribe, send email to <name>-request@gnu.org with a subject
+	of "subscribe", where <name> is the list you want to subscribe to.
+
+Bug Reports
+
+	To report a bug, please file a description of the problem on nano's
+	bug tracker (https://savannah.gnu.org/bugs/?group=nano -- hover on
+	"Bugs", then click "Submit new").  The issue may have already been
+	reported, so please look first.
 
 Current Status