Find a meaningful Category for the non-LibreMesh-specific packages

[ilario]

In #729 the Category (defined inside the packages' Makefile) for some packages changed from LiMe to LibreMesh and more packages will migrate as #766 will get solved.
We should take advantage for finding a better Category for some of the stuff currently under the LiMe submenu but which is not LibreMesh specific, for example shared-state or check-date-http.

(thanks to @jkimmel for highlighting this change in libremesh/libremesh.github.io#112)

[ilario]

The packages that are looking for a meaningful category (and currently they are in the LiMe/LibreMesh category) are:

bandwidth-test @ilario (is being addressed in #775)
batman-adv-auto-gw-mode @altergui
bmx6-auto-gw-mode @p4u
bmx7-auto-gw-bw-mode @p4u
bmx7-auto-gw-mode @p4u
check-date-http @G10h4ck
hotplug-initd-services @G10h4ck

Shared-state packages should be LibreMesh-independent but there is some usage of lime.utils and lime.wireless in the main shared-state package, so I would not change their category.

[ilario]

Changing category did not receive interest in years. Closing. Rather, we should remove from this repository packages that are not LibreMesh-specific and move them to OpenWrt repositories or LibreRouterOS ones.