- publishing options (XEP-0060 §7.1.5) implementation.
- jp pubsub/set can specify publish-options using `-f` and `-F`
- doc has been updated to explain that
- psItemSend and psItemsSend now use serialisation for "extra"
- publish-options can be specified in extra['publish-options'] with those methods
- added missing `tls_private_key` value in configuration sample
- added a label for `installation`
- removed useless repetition of "Salut à Toi" in overview title
- changed text for jp and primitivus documentations links
- use a better may to indicate keyboard shortcuts in Primitivus