Remove two old docs

The Radar is gone with the return of Slack (#913), and any vestige of
proper queue management has disappeared with it. :-/

www/appendices/channels.spt

@@ -13,6 +13,11 @@ If you would rather communicate with us privately, please send email to
 [[email protected]](mailto:[email protected]).
 
 
+## Slack
+
+Real-time chat happens [on Slack](/appendices/chat).
+
+
 ## GitHub
 
 We use [GitHub](https://github.com/gratipay) to manage our source code and
@@ -22,12 +27,6 @@ discussion happens in the repo for the relevant project, mainly
 [gratipay.com](https://github.com/gratipay/gratipay.com/issues).
 
 
-## Radar
-
-We coordinate using [weekly Radar tickets](/howto/sweep-the-radar). They're a
-good place to start if you're new. Introduce yourself! :-)
-
-
 ## HackerOne
 
 We run our security program [on HackerOne](https://hackerone.com/gratipay).
@@ -41,15 +40,16 @@ YouTube](https://www.youtube.com/user/gratipay/videos). Older ones are in [this
 playlist](http://www.youtube.com/playlist?list=PLivwfG4q6DTAYCmRDmGpljRrpR3yNNSFP).
 
 
-## Slack
 
-Real-time chat happens [on Slack](/appendices/chat).
+# Moribund Channels
 
+We don't really use these anymore. They're listed here as archives.
 
 
-# Moribund Channels
+## Radar
 
-We don't really use these anymore. They're listed here as archives.
+We coordinate using [~~weekly Radar tickets~~](/howto/sweep-the-radar). They're
+a good place to start if you're new. Introduce yourself! :-)
 
 
 ## IRC

www/howto/handle-security-issues.spt

@@ -10,7 +10,7 @@ internal Gratipay collaborators.*
 ## HackerOne
 
 We [use HackerOne](https://hackerone.com/gratipay) to manage our security
-[queue](./manage-queues). Our program description lives [in this
+queue. Our program description lives [in this
 repo](https://github.com/gratipay/inside.gratipay.com/blob/master/www/appendices/security-program.md).
 Make changes using GitHub PRs like normal, and then copy and paste into
 HackerOne once merged.
@@ -75,8 +75,8 @@ GitHub.
 Once the fix is approved and the PR is merged to `master` in `security`, here's
 how to deploy it:
 
- 1. Announce your intention on the [Radar](/howto/sweep-the-radar) so that no-one
-else deploys from the regular repo while you're deploying from `security`.
+ 1. Announce your intention on [Slack](/appendices/chat) so that no-one else
+deploys from the regular repo while you're deploying from `security`.
 
  1. Clone the `security` repo, then configure a couple more remotes:
 ```