move bugs.md to doc/source/ directory

as it's largely for people with source code access.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -14,7 +14,7 @@ about: Used to report a defect in server source code, default configuration file
 - Defect - Non compliance with a standards document, or incorrect API usage.
 - Defect - Unexpected behaviour (obvious or verified by project member).
 
-See [here](https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/bugs.md) for debugging instructions and how to obtain backtraces.
+See [here](https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/source/bugs.md) for debugging instructions and how to obtain backtraces.
 
 # Defect
 ## How to reproduce the issue

.github/contributing.md

@@ -51,7 +51,7 @@ Issues reported for these branches will be closed and locked.
 Contents of a defect report
 ---------------------------
 
-See [doc/bugs](https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/bugs.md) for information
+See [doc/bugs](https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/source/bugs.md) for information
 on what to include, and how to obtain it.
 
 When logging bug reports using the GitHub issue tracker, pay attention to formatting.  You should

.github/issue_template.md

@@ -10,7 +10,7 @@
 - Defect - Unexpected behaviour (obvious or verified by project member).
 - Feature request.
 
-See [here](https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/bugs.md) for debugging instructions and how to obtain backtraces.
+See [here](https://github.com/FreeRADIUS/freeradius-server/blob/master/doc/source/bugs.md) for debugging instructions and how to obtain backtraces.
 
 NOTE: PATCHES GO IN PULL REQUESTS.  IF YOU SUBMIT A DIFF HERE, THE DEVELOPMENT TEAM WILL HUNT YOU DOWN AND BEAT YOU OVER THE HEAD WITH YOUR OWN KEYBOARD. 
 

README.md

@@ -112,7 +112,7 @@ mailing lists first to determine whether it really is a defect or
 missing feature.
 
 Instructions for gathering data for defect reports can be found in
-``doc/bugs.md`` or on the [wiki](https://wiki.freeradius.org/project/bug-reports).
+``doc/source/bugs.md`` or on the [wiki](https://wiki.freeradius.org/project/bug-reports).
 
 Under no circumstances should the issue tracker be used for support
 requests, those questions belong on the user's mailing list.  If you