Remove bug.template file

It's outdated and not really in use anymore.

Discussion: https://www.postgresql.org/message-id/flat/cf7ed2b1-1ebe-83cf-e05e-d5943f67af2d%402ndquadrant.com

.gitattributes

@@ -15,7 +15,6 @@ README.*	conflict-marker-size=32
 *.data						-whitespace
 *.svg						whitespace=-blank-at-eol
 contrib/pgcrypto/sql/pgp-armor.sql		whitespace=-blank-at-eol
-doc/bug.template				whitespace=space-before-tab,-blank-at-eof,blank-at-eol
 src/backend/catalog/sql_features.txt		whitespace=space-before-tab,blank-at-eof,-blank-at-eol
 
 # Test output files that contain extra whitespace

doc/bug.template

-If PostgreSQL failed to compile on your computer or you found a bug,
-please fill out this form and e-mail it to pgsql-bugs@lists.postgresql.org.
-
-If your bug report has security implications and you'd prefer that it not
-become immediately visible in public archives, don't send it to pgsql-bugs.
-Security issues can be reported privately to security@postgresql.org.
-
-If you not only found the problem but solved it and generated a patch
-then e-mail it to pgsql-hackers@lists.postgresql.org instead.  Please use the
-command "diff -c" to generate the patch.
-
-You may also enter a bug report at https://www.postgresql.org/ instead of
-e-mailing this form.
-
-============================================================================
-                        POSTGRESQL BUG REPORT TEMPLATE
-============================================================================
-
-
-Your name		:
-Your email address	:
-
-
-System Configuration:
----------------------
-  Architecture (example: Intel Pentium)		:
-
-  Operating System (example: Linux 2.4.18)	:
-
-  PostgreSQL version (example: PostgreSQL 12devel):  PostgreSQL 12devel
-
-  Compiler used (example: gcc 3.3.5)		:
-
-
-Please enter a FULL description of your problem:
-------------------------------------------------
-
-
-
-
-
-Please describe a way to repeat the problem.   Please try to provide a
-concise reproducible example, if at all possible:
-----------------------------------------------------------------------
-
-
-
-
-
-If you know how this problem might be fixed, list the solution below:
----------------------------------------------------------------------
-
-

src/tools/version_stamp.pl

@@ -102,10 +102,6 @@ sed_file("configure.in",
 	"-e 's/AC_INIT(\\[PostgreSQL\\], \\[[0-9a-z.]*\\]/AC_INIT([PostgreSQL], [$fullversion]/'"
 );
 
-sed_file("doc/bug.template",
-	"-e 's/PostgreSQL version (example: PostgreSQL .*) *:  PostgreSQL .*/PostgreSQL version (example: PostgreSQL $fullversion):  PostgreSQL $fullversion/'"
-);
-
 sed_file("src/include/pg_config.h.win32",
 	"-e 's/#define PACKAGE_STRING \"PostgreSQL .*\"/#define PACKAGE_STRING \"PostgreSQL $fullversion\"/' "
 	  . "-e 's/#define PACKAGE_VERSION \".*\"/#define PACKAGE_VERSION \"$fullversion\"/' "