[book] Improve PostgreSQL configuration section
* Do not advice for specific PostgreSQL version (point to meta-packages if
available in Linux distros);
* First mention packages from Linux distros, put the link to official postgres
documentation at the end;
Closes #2725302.
HTTP cache management
=====================
.. automodule:: cubicweb.web.httpcache
Cache policies
--------------
.. autoclass:: cubicweb.web.httpcache.NoHTTPCacheManager
.. autoclass:: cubicweb.web.httpcache.MaxAgeHTTPCacheManager
.. autoclass:: cubicweb.web.httpcache.EtagHTTPCacheManager
.. autoclass:: cubicweb.web.httpcache.EntityHTTPCacheManager
Exception
---------
.. autoexception:: cubicweb.web.httpcache.NoEtag
Helper functions
----------------
.. autofunction:: cubicweb.web.httpcache.set_http_cache_headers
.. NOT YET AVAILABLE IN STABLE autofunction:: cubicweb.web.httpcache.lastmodified