Add theme selector

app/pages/settings.py

@@ -1,17 +1,27 @@
 import streamlit as st
-from pandas.core.ops.docstrings import key
-from pandas.io.formats.style import Styler
 
 import queries.crud as crud
+import themes as th
 
 is_login_enabled = hasattr(st, 'user') and hasattr(st.user, 'is_logged_in')
 is_logged_in = is_login_enabled and st.user.is_logged_in
 
 st.title("Settings")
-
 if hasattr(st.session_state, 'user_name'):
     st.markdown(f"Currently logged in as **{st.session_state.user_name}**")
 
+
+st.header("Theme")
+themes = st.session_state.themes
+with st.container(horizontal=True, width="stretch"):
+    for theme in ["light", "dark"]:
+        if st.button(label=themes[theme]["button_face_label"],
+                 icon = themes[theme]["button_face_icon"],
+                 disabled = (theme == st.session_state.current_theme),
+                 width = "stretch"):
+            th.change_theme(theme)
+            st.rerun()
+
 st.header("Colors")
 with st.container(key="settings-color-selector"):
     palettes = crud.get_color_palettes()