removed accidentally created submodule, broke everything up into JS modules, put CSS in its own file. create game and update state from FEN-formatted strings. also implemented serialization to FEN

constants.js

@@ -0,0 +1,20 @@
+
+export const LETTER_PIECE_NAME_LOOKUP = {}
+export const PIECE_NAME_LETTER_LOOKUP = {}
+
+for (const [letter, name] of Object.entries({
+    r: 'rook',
+    b: 'bishop',
+    q: 'queen',
+    k: 'king',
+    p: 'pawn',
+    n: 'knight',
+})) {
+    LETTER_PIECE_NAME_LOOKUP[letter] = `black-${name}`
+    LETTER_PIECE_NAME_LOOKUP[letter.toUpperCase()] = `white-${name}`
+    PIECE_NAME_LETTER_LOOKUP[`black-${name}`] = letter
+    PIECE_NAME_LETTER_LOOKUP[`white-${name}`] = letter.toUpperCase()
+}
+
+export const files = Array.from("abcdefgh")
+export const STARTING_FEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"