feat!: drop modules, general refactor and cleanup

runtime/queries/elsa/folds.scm

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+(reduction) @fold

runtime/queries/elsa/highlights.scm

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+; Keywords
+[
+  "eval"
+  "let"
+] @keyword
+
+; Function
+(function) @function
+
+; Method
+(method) @function.method
+
+; Parameter
+(parameter) @variable.parameter
+
+; Variables
+(identifier) @variable
+
+; Operators
+[
+  "\\"
+  "->"
+  "="
+  (step)
+] @operator
+
+; Punctuation
+[
+  "("
+  ")"
+] @punctuation.bracket
+
+":" @punctuation.delimiter
+
+; Comments
+(comment) @comment @spell

runtime/queries/elsa/indents.scm

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+(reduction) @indent.begin
+
+[
+  (ERROR)
+  (comment)
+] @indent.auto

runtime/queries/elsa/injections.scm

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+((comment) @injection.content
+  (#set! injection.language "comment"))

runtime/queries/elsa/locals.scm

@@ -0,0 +1,12 @@
+[
+  (source_file)
+  (reduction)
+] @local.scope
+
+(identifier) @local.reference
+
+(function) @local.definition.function
+
+(method) @local.definition.method
+
+(parameter) @local.definition.parameter