* feat(keebwerk): added VIA support keymap for keebwerk nano slider
Added VIA support for keebwerk nano slider, VIA json is keebwerk_nano_via.json
Fixed midi2vol keymap where comma symbol is missing from enum "custom_layers"
* feat(keebwerk): removed VIA json as requested
* Update keyboards/keebwerk/nano_slider/keymaps/via/keymap.c
* Update keyboards/keebwerk/nano_slider/keymaps/via/keymap.c
* Fix(PR): removed file as requested
Wilfrid Li