;doc: update issue templates

[ci skip]

.github/ISSUE_TEMPLATE/a-bug.md

@@ -7,10 +7,8 @@ labels: A BUG
 Thank you for helping to make hledger better!
 
 If you're not sure it's a bug, or if some discussion would help,
-contact us first on the #hledger IRC chat room or the mail list:
+contact us first on chat (quickest) or the mail list:
-
+https://hledger.org#help-feedback
-- http://irc.hledger.org  (best; no chat client needed)
-- http://list.hledger.org
 
 Things to check before reporting:
 

.github/ISSUE_TEMPLATE/a-wish.md

@@ -4,12 +4,16 @@ about: A request for something new to improve hledger software, documentation, e
 labels: A WISH
 ---
 
-Thank you for your input!
+Thank you for helping to make hledger better!
 
-Note, we try to not clutter the bug tracker with wishlist items and ideas.
+We try to not clutter the bug tracker with too many wishlist items.
-Often it's best to raise these first on the #hledger IRC chat room or the mail list:
+Often it's best to discuss and attract interest on chat or the mail list first;
+use your best judgement.
+https://hledger.org#help-feedback
 
-http://irc.hledger.org   (quickest; no chat client needed)
+Things to check before requesting:
-http://list.hledger.org  (most eyeballs)
+
+- Have you looked for the feature in (the right version of) the manual ? 
+  Use `hledger help [--help]` to view the built-in manuals,
+  or view the hledger.org -> REFERENCE MANUALS and choose the proper version at the top of the page.
 
-to discuss solutions and attract interest. Use your best judgement.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,10 @@
+# https://help.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository
+
+blank_issues_enabled: true
+contact_links:
+  - name: hledger chat or mail list
+    url: https://hledger.org/#help-feedback
+    about: Please send questions and support requests here.
+  - name: hledger project security issues
+    url: mailto:simon@joyful.com
+    about: Please report security vulnerabilities here.

.github/ISSUE_TEMPLATE/support.md

@@ -1,13 +0,0 @@
----
-name:  General help / discussion
-about: Need help with hledger ? Ask on our IRC chat room or mail list.
-labels:
----
-
-Requests for help and support with hledger are very welcome, and
-useful feedback for the project. But usually, you should not submit
-them here; instead, ask on the #hledger IRC chat room or mail list,
-and we'll be happy to help:
-
-http://irc.hledger.org   (quickest; no chat client needed)
-http://list.hledger.org