* usage page now has more dynamic part where user
can enter id and publis ssh keys and the server will
generate the appropriate commmands to execute depending on the local and remote shell.
activity and updated documentation.
* downloads will now download again. Because of hx-boost
the downloads where rendered in the browser. Now
disabling hx-boost for the downloads section.
* relative link for sessions page
* removed the Async utility
* now using Ping message to webclient for keep alive instaed of actual content
* added remote shell to AgentInfo
* retry of connections to the agent
* better logging for SynchronizeStreams
