[Keymap] Display default layer name (#14819)

Add KC_BSLS key to Horizon keyboard default layout (#14815)

* Define Horizon keyboard

* Set indentation according to QMK coding convention

* Update horizon keyboard readme to satisfy current QMK template

* Use row-column order in horizon readme

* Update keyboards/horizon/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/rules.mk

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/info.json

Co-authored-by: Ryan <fauxpark@gmail.com>

* Update keyboards/horizon/info.json

Co-authored-by: Ryan <fauxpark@gmail.com>

* Add KC_BSLS to Horizon default keymap

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

contra, fractal: Remove wrongly copypasted pin E6 manipulation code (#14818)

Apparently the default keymaps for `contra` and `fractal` were derived
from some `planck` keymap which contained code to control the status LED
in the implementation of the `BACKLIT` custom keycode.  Unfortunately,
the code to control the LED manipulated the `E6` pin directly, and it
was copied without changes, but the `contra` and `fractal` boards use
the `E6` pin in the matrix, therefore pressing the key mapped to
`BACKLIT` resulted in phantom keypresses for all keys in the
corresponding column.

maxr1998/pulse4k: use layout macros in keymaps (#14808)

Kopibeng MNK88 Patch (#14807)

* refactor default keymap

- correct keycode sequence (`KC_RGHT` was in the wrong place)
- change tabs to spaces (four-space indent)
- update grid alignment

* refactor via keymap

- change tabs to spaces (four-space indent)
- update grid alignment

Lucid Alexa layout macro rework (#14799)

* refactor keymaps for readability

- use QMK-native keycode aliases
- physically align keycodes

* rework layout macro

A discrepancy between the default and via keymaps prompted a deep dive into the keyboard's switch matrix, which led to the discovery that (1) the layout macro's arguments were not arranged physically, and (2) the keymaps didn't assign the keycodes to the same switches (the default keymap's keycodes were in the wrong sequence).

Additionally, the layout macro was built to support a split Backspace, but named as if it were for a 2u Backspace, which broke the enabled support for Community Layout keymaps.

This commit:

- arranges the layout macro arguments according to physical order
- corrects the keymaps
- renames the layout macro to specify the split Backspace
- disables Community Layout support
- updates the `info.json` data

* add LAYOUT_65_ansi_blocker

* enable Community Layout support

* update `info.json` metadata

- use full product listing URL
- use GitHub username for maintainer field

* update readme

- fix vendor link in lead paragraph
- update metadata list
  - use GitHub username of keyboard maintainer
  - correct Supported Hardware
  - add Hardware Availability link
- add flashing and bootloader instructions

Kopibeng MNK88 Layout Extension (#14796)

* friendly-format info.json

* mnk88.h: use QMK 3-character notation

* mnk88.h: add matrix diagram

* add LAYOUT_tkl_ansi_f13

* add LAYOUT_tkl_ansi_tsangan_f13

* add LAYOUT_tkl_iso_f13

* add LAYOUT_tkl_iso_tsangan_f13

[Keyboard] Add MachKeyboards Mach3 (#14791)

Co-authored-by: Ryan <fauxpark@gmail.com>

[Keyboard] Add "Center x Enter" (#14790)

Co-authored-by: Drashna Jaelre <drashna@live.com>

KabeDon98E Refactor (#14778)

Co-authored-by: Joel Challis <git@zvecr.com>

[Keymap] Add workman layout (#14792)

[Keyboard] Add ISOlation and some kb-elmo keyboard updates (#14656)

Co-authored-by: Drashna Jaelre <drashna@live.com>

Nordic60 layout rework/extension (#14794)

[Keyboard] Add Split65 to keyboards/handwired (#13264)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: Joris Wachsmuth <jwachsmuth@techfak.uni-bielefeld.de>

[Keymap] Added Gherkin VIA keymap (#14779)

[Keyboard] z34 split keyboard by zigotica (#14582)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

[Keymap] Adding my personal Planck layout (#14564)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

[Keymap] Jonavin new obe keymap (#14657)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Jonavin <=>

handwired/nicekey optimisation (#14788)

* handwired/nicekey optimisation

* Add some consts

* Read address from progmem, pass it into send_string_with_delay_P

Allow AVR Bootloader size to be configurable (#14783)

* Allow AVR Bootloader size to be configurable

* revert changes to atmel dfu