create a wwwdev.sh entry point for helping live web design/development (#92)

* create a wwwdev.sh entry point for developing the web part

* rename script

* fix README

* add a note

* don't depend on deltachat python package

* avoid bailing out on jinja2 errors, and provide file-url for instant clickability

* in webdev mode make page auto-refresh every 3 seconds

www/src/info.md

@@ -0,0 +1,39 @@
+
+<img width="800px" src="collage-info.png"/>
+
+## More information 
+
+### Choosing a chatmail address instead of using a random one
+
+In the Delta Chat account setup 
+you may tap `LOG INTO YOUR E-MAIL ACCOUNT` 
+and fill the two fields like this: 
+
+- `Address`: invent a word with *exactly* nine characters 
+   and append `@{{config.mail_domain}}` to it. 
+
+- `Password`: invent at least 9 characters. 
+
+If the e-mail address is not yet taken, you'll get that account. 
+The first login sets your password. 
+
+
+### Rate and storage limits 
+
+- Un-encrypted messages are blocked to recipients outside
+  {{config.mail_domain}} but setting up contact via [QR invite codes](https://delta.chat/en/help#howtoe2ee) 
+  allows your messages to pass freely to any outside recipients.
+
+- You may send up to 60 messages per minute
+
+- Messages are unconditionally removed 40 days after arriving on the server
+
+- You can store up to [100MB messages on the server](https://delta.chat/en/help#what-happens-if-i-turn-on-delete-old-messages-from-server)
+
+
+### Who are the operators? Which software is running? 
+
+This chatmail provider is run by a small voluntary group of devs and sysadmins,
+who [publically develop chatmail provider setups](https://github.com/deltachat/chatmail).
+Chatmail setups aim to be very low-maintenance, resource efficient and 
+interoperable with any other standards-compliant e-mail service.