landmarks, skiplink, remove bad attrs, autocomplete search layout.html: Add main and nav landmarks to layout templte. Add skiplink to get to main. Remove Description meta tag from layout template in favor of description metadata in individual files. Remove obsolete border attribute from sourceforge logo. Add autocomplete="on" attribute for search input box. doc/*.txt Remove language attribute from description meta tags. These changes also occur for other files not in this commit. Thse other files have changes to files for the 2.2.0 release not yet tobe committed.

--- a/doc/user_guide.txt	Tue Jul 12 14:16:58 2022 -0400
+++ b/doc/user_guide.txt	Tue Jul 12 15:00:30 2022 -0400
@@ -1,5 +1,5 @@
 .. meta::
-    :description language=en:
+    :description:
         Describes how to interact with and use a tracker with the
         Roundup Issue Tracker.