[web] stop looking at a request's Cache-Control header
As per RFC 7234 (HTTP 1.1 Caching):
The "Cache-Control" header field is used to specify directives for
caches along the request/response chain.
CubicWeb is not a cache.
.. role:: raw-html(raw)
:format: html
RSS driven
----------
RSS is a pretty useful technology that can be widely used on this
site. Any set of data can be presented as RSS. You can then plug in
an RSS reader into that and follow the site activity. For example :
:raw-html:`<p><a class="reference"
href="../view?vid=rss&rql=Any+X%2CM+WHERE+X+modification_date+M+ORDERBY+M+DESC+LIMIT+30"><img
alt="rss" src="../data/rss.png"> latest changes</a></p>`