Fix the rst syntax for most documentation

docs/general.rst

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+General concepts
+================
+
+Philosophy
+----------
+
+The philosophy behind Mailu is very simple and based on applying the
+following principles, with decreasing priority:
+
+ 1. a proper mail server runs only free software
+ 2. a proper mail server is easy to setup and maintain
+ 3. a proper mail server offers proper security
+ 4. a proper mail server has a simple and beautiful user interface
+
+Mailu was designed and is kept up to date based on these. Among the most
+structuring choices, the following were quite challenging:
+
+ - Mailu is based on containers (plural) so that any part can be reused
+   in separate projects and that updating or swapping any component does
+   not require to alter others.
+ - Mailu offers mail and does not bring any bloat in the default setup.
+   Additional features are available but not required.
+ - Mailu has a central front container that routes all HTTP and mail
+   traffic.
+ - Mailu has a Web administration interface that exposes both a Web ui
+   and internal API.
+ - Mailu authors are all equal in regard to copyright, thus the license
+   will remain free unless all contributors agree otherwise.
+
+History
+-------
+
+Mailu started in late 2014 and was named Freeposte, the Freeposte.io at
+the time. Early Mailu versions were maintained by a french nonprofit
+named TeDomum, the initial purpose being to re-design their free e-mail
+hosting service as Docker containers and add some fresh UI to the mix
+in order to replace old interfaces like PostfixAdmin.
+
+At the time, Post.io was one of the most interesting solutions out there
+and was only lacking a free software licence (hence Mailu's initial
+name). Later, around late 2015, Mailu became a public project including
+contributions from third parties.
+
+Today, Mailu is running many mail instances, but remains a community
+project, where everyone is welcome to take part.
+