TKC1800 refactor and Configurator visual fixes (#4870)

* TKC1800: refactor

- tkc1800.h
  - updated to use #pragma once
  - visual alignment
- update config.h files to use #pragma once
- update all keymaps to use #include QMK_KEYBOARD_H
- delete redundant mod mask, KC_TRNS, and KC_NO definitions
- reformat keymap layers for readability
- add block comment for Function layer in default keymap
- delete commented action_get_macro code blocks (deprecated function)
- update files to better conform with QMK coding conventions
- update smt keymap to use set_single_persistent_default_layer (instead of persistent_default_layer_set)
- replace instances of `?=` with `=` in rules.mk

* TKC1800: Configurator visual fixes

- correct key sizes and positioning
- reformat file so each physical key object has its own line for readability
- update and add `label` keys for readability

* TKC1800: readme update

- fix image gallery link
- update Hardware Supported and Hardware Availability lines
- update make example (add :default suffix)
- update QMK Docs links (Newbs Guide; grammar)

* Add missing semicolons to smt keymap

keyboards/tkc1800/config.h

@@ -15,8 +15,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef CONFIG_H
-#define CONFIG_H
+#pragma once
 
 #include "config_common.h"
 
@@ -182,5 +181,3 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 /* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
 //#define MIDI_TONE_KEYCODE_OCTAVES 1
-
-#endif