Doc updates/indexing. doc/admin_guide.txt, doc/customizing.txt, doc/features.txt, doc/installation.txt, doc/mysql.txt, doc/postgresql.txt: adding index entries doc/customizing.txt: reference schema changes later in document in addition to wiki. website/www/contents.txt: make wiki url https:.... Remove indices/tables as they don't show up in web interface. Put docs/announcement.txt into hidden toctree to silence warning from sphinx. Announcement.txt is referenced from index.txt so can't silence by adding to conf.py exclude_patern. website/www/index.txt: mention security and other improvements in jinja2 templates. website/www/conf.py: get rid of all warning by using exclude_patterns to ignore docs that aren't included. Remove exclude_trees using exclude_pattern instead. Make html_add_permalinks value acceptable so no warning reported. website/www/_static/style.css, website/www/_templtes/layout.html: add prev/next/index links for all doc pages.

--- a/doc/admin_guide.txt	Mon May 11 11:12:25 2020 -0400
+++ b/doc/admin_guide.txt	Wed May 13 00:40:14 2020 -0400
@@ -289,6 +289,8 @@
     python setup.py install
 
 
+.. index:: database; convert from one database backend to another
+
 Migrating Backends
 ------------------
 
@@ -338,6 +340,8 @@
    machine, and
 6. start the tracker web and email frontends on the new machine.
 
+.. index::
+   pair: roundup; migrate from other bugtracker software
 
 Migrating From Other Software
 -----------------------------
@@ -364,6 +368,8 @@
   The ``<N>`` value is ``int(<id> / 1000)``.
 
 
+.. index:: pair: roundup-admin; managing users
+
 Adding A User From The Command-Line
 -----------------------------------