refactor: remove unused Optuna visualization utility

src/single-core-regen/util/__init__.py

@@ -1,3 +1,2 @@
 from .datasets import FiberRegenerationDataset  # noqa: F401
-from .optuna_vis import show_figures # noqa: F401
 from .plot import eye # noqa: F401

src/single-core-regen/util/optuna_vis.py

@@ -1,18 +0,0 @@
-from dash import Dash, dcc, html
-import logging
-import dash_bootstrap_components as dbc
-
-
-def show_figures(*figures):
-    for figure in figures:
-        figure.layout.template = 'plotly_dark'
-
-    app = Dash(external_stylesheets=[dbc.themes.DARKLY])
-    app.layout = html.Div([
-        dcc.Graph(figure=figure) for figure in figures
-    ])
-    log = logging.getLogger('werkzeug')
-    log.setLevel(logging.ERROR)
-
-    app.show = lambda *args, **kwargs: app.run_server(*args, **kwargs, debug=False)
-    return app