feat(cli): add convert option to generate html presentations (#66)

* wip(cli): convert slides to html using RevealJS

* wip: convert - almost fully working

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fix: remove unused file

* fix: add last slides in now performed during rendering

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* chore(ci): testing ConvertExample too

* fix: ManimGL does not consider wait as an animation

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

manim_slides/commons.py

@@ -3,7 +3,7 @@ from typing import Callable
 import click
 from click import Context, Parameter
 
-from .defaults import CONFIG_PATH
+from .defaults import CONFIG_PATH, FOLDER_PATH
 from .manim import logger
 
 
@@ -60,3 +60,15 @@ def verbosity_option(function: Callable) -> Callable:
         show_envvar=True,
         callback=callback,
     )(function)
+
+
+def folder_path_option(function: Callable) -> Callable:
+    """Wraps a function to add folder path option."""
+    return click.option(
+        "--folder",
+        metavar="DIRECTORY",
+        default=FOLDER_PATH,
+        type=click.Path(exists=True, file_okay=False),
+        help="Set slides folder.",
+        show_default=True,
+    )(function)