feat: implement custom comment syntax

renderer/fifty_ohm_html_renderer.py

@@ -0,0 +1,21 @@
+from mistletoe import HtmlRenderer
+from mistletoe.block_token import BlockToken
+
+
+class FiftyOhmHtmlRenderer(HtmlRenderer):
+    def __init__(self):
+        super().__init__(Comment)
+
+    def render_comment():
+        return None
+
+
+class Comment(BlockToken):
+    @staticmethod
+    def start(line):
+        return line.startswith("%")
+
+    @classmethod
+    def read(cls, lines):
+        next(lines)
+        return None