Actually deprecate the old stuff (forgot a few imports).

src/formatitko/formatitko.py

@@ -7,12 +7,9 @@ import subprocess
 import shutil
 
 # Import local files
-from .transform import transform
 from .util import import_md
 from .context import Context, BlockGroup
 from .katex import KatexClient
-from .html import html
-from .tex import tex
 from .images import ImageProcessor
 from .output_generator import OutputGenerator, FormatitkoRecursiveError
 from .html_generator import HTMLGenerator