add minimal Zed syntax highlighting for Ferro (#2)

* add minimal Ferro tree-sitter grammar

* add temporary tree-sitter generation workflow

* generate Ferro tree-sitter parser

* drop custom grammar in favor of Rust grammar reuse

* remove temporary tree-sitter generation workflow

* add Zed extension manifest for Ferro

* configure Ferro files for Zed

* add Ferro syntax highlighting queries

* remove generated custom tree-sitter parser

* remove generated custom tree-sitter node types

* tighten Ferro Zed highlight queries

* add minimal Ferro tree-sitter grammar

* point Zed at Ferro grammar

* refresh Ferro highlights

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

editors/zed/languages/ferro/config.toml

@@ -0,0 +1,6 @@
+name = "Ferro"
+grammar = "ferro"
+path_suffixes = ["fe"]
+line_comments = ["// "]
+tab_size = 4
+hard_tabs = false

editors/zed/languages/ferro/highlights.scm

@@ -0,0 +1,12 @@
+; Ferro syntax highlighting for Zed.
+
+(line_comment) @comment
+(block_comment) @comment
+(string_literal) @string
+(char_literal) @string
+(integer_literal) @number
+(builtin) @function.builtin
+(builtin_type) @type.builtin
+(keyword) @keyword
+(operator) @operator
+(punctuation) @punctuation.delimiter