[Keymap] Reorganization, cleanup and readmes for drashna code (#15617)

users/drashna/keyrecords/unicode.md

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+# Custom Unicode
+
+To disable, add `CUSTOM_UNICODE_ENABLE = no` to the keymap's `rules.mk`.  
+
+This disables all of the various implementations of unicode, enables the common unicode core, and allows usage. 
+
+In addition to a number of unicode keycodes: 
+
+* `UC_FLIP` - `(ノಠ痊ಠ)ノ彡┻━┻`
+* `UC_TABL` - `┬─┬ノ( º _ ºノ)`
+* `UC_SHRG` - `¯\_(ツ)_/¯`
+* `UC_DISA` -  `ಠ_ಠ`
+* `UC_IRNY` - `⸮`
+* `UC_CLUE` - `‽`
+
+There are a number of unicode typing modes. This replaces the normal alpha keys with special unicodes. 
+
+* `KC_WIDE` - ｔｈｉｓ ｉｓ ｗｉｄｅ ｍｏｄｅ
+* `KC_SCRIPT` - 𝓽𝓱𝓲𝓼 𝓲𝓼 𝓼𝓬𝓻𝓲𝓹𝓽 𝓶𝓸𝓭𝓮
+* `KC_BLOCKS` - 🆃🅷🅸🆂 🅸🆂 🅱🅻🅾🅲🅺 🅼🅾🅳🅴
+* `KC_REGIONAL` - 🇹‌‌🇭‌‌🇮‌‌🇸‌‌ ‌‌🇮‌‌🇸‌‌ ‌‌🇷‌‌🇪‌‌🇬‌‌🇮‌‌🇴‌‌🇳‌‌🇦‌‌🇱‌‌ ‌‌🇲‌‌🇴‌‌🇩‌‌🇪‌‌
+* `KC_AUSSIE` - ǝpoɯ ǝᴉssnɐ sᴉ sᴉɥʇ
+* `KC_ZALGO` - t̨͕͙̺͍͐̾ĥ̻ï̳̻̗̜͔ͦs͎̠͈͓͗̀ i̶̫ͭ̆s̛̫̻̜̝͑͡ z̩͈̠͗a͚̜̓͜l͈̟g͋͢͝ò͚ͥ͘͡͞ ḿ̴̡̻̼̔ͪò͔̭̿ͪ̍ḏ̻̊̄̈e̳͕̤ͣͯ
+* `KC_NOMODE` - this is the normal typing mode with no unicode glyphs
+
+
+Credit goes to ridingqwerty and tzarc for the unicode typing modes.