feat!: drop modules, general refactor and cleanup

runtime/queries/bibtex/folds.scm

@@ -0,0 +1,3 @@
+[
+ (entry)
+] @fold

runtime/queries/bibtex/highlights.scm

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+; CREDITS @pfoerster (adapted from https://github.com/latex-lsp/tree-sitter-bibtex)
+
+[
+  (string_type)
+  (preamble_type)
+  (entry_type)
+] @keyword
+
+[
+  (junk)
+  (comment)
+] @comment
+
+[
+  "="
+  "#"
+] @operator
+
+(command) @function.builtin
+
+(number) @number
+
+(field
+  name: (identifier) @field)
+
+(token
+  (identifier) @parameter)
+
+[
+  (brace_word)
+  (quote_word)
+] @string
+
+[
+  (key_brace)
+  (key_paren)
+] @symbol
+
+(string
+  name: (identifier) @constant)
+
+[
+  "{"
+  "}"
+  "("
+  ")"
+] @punctuation.bracket
+
+"," @punctuation.delimiter

runtime/queries/bibtex/indents.scm

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+[
+ (entry)
+] @indent.begin
+
+[
+ "{"
+ "}"
+] @indent.branch
+
+(comment) @indent.ignore