fixup links

howto/conference.md

@@ -7,9 +7,11 @@ Jitsi, or Big Blue Button.
 
 [Merriam-Webster]: https://www.merriam-webster.com/dictionary/conference
 
-While [howto/irc](howto/irc) can also be used to hold a meeting or conference, it's
+While [howto/irc][] can also be used to hold a meeting or conference, it's
 considered out of scope here.
 
+[howto/irc]: howto/irc
+
 [[_TOC_]]
 
 # Tutorial
@@ -37,12 +39,17 @@ considered out of scope here.
 
 ## Installation
 
-TPI is currently using [Big Blue Button](https://bigbluebutton.org/) hosted by [meet.coop](https://meet.coop/)
+TPI is currently using [Big Blue Button][] hosted by [meet.coop][]
 at <https://tor.meet.coop/> for regular meetings.
 
+[meet.coop]: https://meet.coop/
+[Big Blue Button]: https://bigbluebutton.org/
+
 ## SLA
 
-N/A. Meet.coop has a [disclaimer](https://www.meet.coop/disclaimer/) that serves as a terms of service.
+N/A. Meet.coop has a [disclaimer][] that serves as a terms of service.
+
+[disclaimer]: https://www.meet.coop/disclaimer/
 
 ## Design
 
@@ -58,8 +65,11 @@ There is no issue tracker specifically for this project, [File][] or
 
 Be warned that TPA does not manage this service and therefore is not
 in a position to fix most issues related with this service. Big Blue
-Button's [issue tracker is on GitHub](https://github.com/bigbluebutton/bigbluebutton/issues) and meet.coop has a
-[forum](https://forum.meet.coop/).
+Button's [issue tracker is on GitHub][] and meet.coop has a
+[forum][].
+
+[forum]: https://forum.meet.coop/
+[issue tracker is on GitHub]: https://github.com/bigbluebutton/bigbluebutton/issues
 
 ### Known issues
 
@@ -77,7 +87,9 @@ TPA does not monitor this instance.
 
 ## Logs and metrics
 
-N/A. Meet.coop has a [privacy policy](https://www.meet.coop/privacy/).
+N/A. Meet.coop has a [privacy policy][].
+
+[privacy policy]: https://www.meet.coop/privacy/
 
 ## Backups