modify procedure to talk about issues

Author: nikomatsakis

procedures/steering-meeting.md

@@ -74,13 +74,18 @@ meetings, rather than (e.g.) planning things at the last minute.
 
 ## Adding a proposal
 
-Proposals can be added by opening a PR and adding a new file into the
-[proposals] directory. The file should use the [proposal
-template][template], but renamed to a suggestive title. **This format
-is meant to be lightweight:** Proposals are generally not expected to
-be a lot of work to produce.
-
-[proposals]: /proposals
+Proposals can be added by opening an issue on the [compiler-team
+repository][ct]. There is an issue template for meeting proposals that
+gives directions. The basic idea is that you prepare your proposal in
+a gist/hackmd/document based on [this template][template] and then
+link to that in the issue, along with a few other details. **This
+format is meant to be lightweight:** Proposals are generally not
+expected to be a lot of work to produce. Accepted proposals will be
+added to the [proposals] directory (and linked to from the actual
+minutes).
+
+[ct]: https://github.com/rust-lang/compiler-team
+[proposals]: /proposals/
 [template]: /proposals/_template.md
 
 ### Expectations for a technical proposal