feat(datasheet): use mustache for shuttle_index

docs/shuttle_index_header.md

@@ -1,6 +0,0 @@
-# {name}
-
-This repository contains the GDS file for the [{name}](https://tinytapeout.com) project. It was generated from {git_repo}@{git_commit}.
-
-## Project Index
-

docs/shuttle_index_header.md.mustache

@@ -0,0 +1,6 @@
+# {{name}}
+
+This repository contains the GDS file for the [{{name}}](https://tinytapeout.com) project. It was generated from {{git_repo}}@{{git_commit}}.
+
+## Project Index
+

documentation.py

@@ -24,13 +24,16 @@ class Docs:
     def build_index(self, filename: str = "shuttle_index.md"):
         logging.info(f"building {filename}")
         repo = git.Repo(".")
-        readme = self.load_doc_template("shuttle_index_header.md")
+        readme = self.load_doc_template("shuttle_index_header.md.mustache")
         with open(filename, "w") as fh:
             fh.write(
-                readme.format(
+                chevron.render(
-                    name=self.config["name"],
+                    readme,
-                    git_repo=get_first_remote(repo),
+                    {
-                    git_commit=repo.head.commit.hexsha,
+                        "name": self.config["name"],
+                        "git_repo": get_first_remote(repo),
+                        "git_commit": repo.head.commit.hexsha,
+                    },
                 )
             )
             fh.write("| Address | Author | Title | Type | Git Repo |\n")