Reorganise Miryoku Repositories

[manna-harbour]

• [x] move Miryoku QMK from https://github.com/manna-harbour/qmk_firmware to https://github.com/manna-harbour/miryoku_qmk
• [x] submit QMK PR
• [x] update forkreadme, description, and social on https://github.com/manna-harbour/qmk_firmware
• [x] enable Miryoku Discussions
• [x] move Issues from https://github.com/manna-harbour/miryoku_qmk to Miryoku Discussions
• [x] add redirects from https://github.com/manna-harbour/qmk_firmware/tree/miryoku to https://github.com/manna-harbour/miryoku
• [x] copy docs from Miryoku QMK to Miryoku
• [x] copy babel from Miryoku QMK to Miryoku Babel
• [x] publish Miryoku Babel
• [x] remove docs and babel from Miryoku QMK
• [x] submit QMK PR
• [x] merge Miryoku ZMK babel into Miryoku Babel
• [ ] sync mappings between Miryoku QMK, Miryoku ZMK, and Miryoku KMK
• [ ] move mapping docs from Miryoku QMK, Miryoku ZMK, and Miryoku KMK into Miryoku