Add Sinc Rev. 4 (#21130)

* Fork Rev. 3 to 4

* Update RGB LED positions

* Adjust RGB positions

* Enable more RGB modes

* Update copyrights

* Add license headers to keymaps

* Use same type of license header

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

* Fix I2C pins

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

[Keyboard]add 5108 Keyboard. (#21184)

Co-authored-by: adophoxia <100170946+adophoxia@users.noreply.github.com>
Co-authored-by: jack <0x6a73@protonmail.com>

[Keyboard] Add mokey12x2 (#20702)

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

[Keyboard] jaykeeb skyline (#21219)

[Keyboard] rainkeebs trailmix (#20189)

Co-authored-by: jack <0x6a73@protonmail.com>

[Keyboard] Add ErgoStrafer keyboard (#21195)

[Keyboard] Add ScottoNum macropad (#21208)

[Keyboard] Add ScottoFrog macropad (#21209)

[Keyboard] Add orba keyboard (#21132)

[Keyboard] Add ScottoSplit Keyboard (#20945)

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

[Keyboard] Add Flashquark Horizon Z (#21055)

Co-authored-by: jack <0x6a73@protonmail.com>

[Keyboard] Add Scotto34 (PCB Edition) (#21085)

Co-authored-by: Albert Y <76888457+filterpaper@users.noreply.github.com>

[Keyboard] Add Scotto9 handwired macropad (#21105)

Co-authored-by: Albert Y <76888457+filterpaper@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>

[Keyboard] Add kibou/winter (#21161)

[Keyboard] Adding OSAv2 Topre PCB (#21080)

Atreyu: correct layout data (#21197)

[Keymap] thunderbird2086 layer status with RGB lighting/matrix (#21063)

Up keymap (#20769)

flinguenheld keymap aurora sweep

EC Alveus (#20840)

Cipulot's EC Alveus PR

Update newbs docs with some rp2040 stuff (#21186)

* Update newbs_building_firmware_configurator.md

* Update docs/newbs_flashing.md


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