Add a "Deploying" section to proxy/README.md.

proxy/README.md

@@ -26,6 +26,48 @@ To run locally, either:
 - For a more fully featured "debug" version,
   start a webserver and navigate to `snowflake.html`.
 
+### Preparing to deploy
+
+Background information:
+ * https://bugs.torproject.org/23947#comment:8
+ * https://help.torproject.org/tsa/doc/static-sites/
+ * https://help.torproject.org/tsa/doc/ssh-jump-host/
+
+You need to be in LDAP group "snowflake" and have set up an SSH key with your LDAP account.
+In your ~/.ssh/config file, you should have something like:
+
+```
+Host staticiforme
+HostName staticiforme.torproject.org
+User <your user name>
+ProxyJump people.torproject.org
+IdentityFile ~/.ssh/tor
+```
+
+### Deploying
+
+```
+npm run build
+```
+
+Do a "dry run" rsync with `-n` to check that only expected files are being changed. If you don't understand why a file would be updated, you can add the `-i` option to see the reason.
+
+```
+rsync -n --delete -crv build/ staticiforme:/srv/snowflake.torproject.org/htdocs/
+```
+
+If it looks good, then repeat the rsync without `-n`.
+
+```
+rsync --delete -crv build/ staticiforme:/srv/snowflake.torproject.org/htdocs/
+```
+
+Then run the command to copy the new files to the live web servers:
+
+```
+ssh staticiforme 'static-update-component snowflake.torproject.org'
+```
+
 ### Parameters
 
 With no parameters,