[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.
CSS Coding Standards--------------------(Draft, to be continued):Naming: camelCaseIndentation rules~~~~~~~~~~~~~~~~~- 2 espaces avant les propriétés- pas d'espace avant les ":", un espace après- 1 seul espace entre les différentes valeurs pour une même propriétéDocumentation~~~~~~~~~~~~~Please keep rules semantically linked grouped together, with a comment aboutwhat they are for.Recommendation~~~~~~~~~~~~~~- Try to use existing classes rather than introduce new ones- Keep things as simple as possible while in the framework- Think about later customization by application- Avoid introducing a new CSS file for a few lines of CSS, at least while the framework doesn't include packing functionalities