Start restructuring of app to make it more modular, and improve layout a bit

app/components/upload_component.py

@@ -0,0 +1,23 @@
+
+from dash import Dash, html, dcc, callback, Output, Input, State, dash_table
+import dash_bootstrap_components as dbc
+
+upload_component = dbc.Row([
+    html.H3("Open HDF5 file"),
+
+    
+    dcc.Upload(
+    id='upload-image',
+    children=html.Div(['Drag and Drop or ',html.A('Select Files')]),
+        style={
+            'width': '100%',
+            'height': '60px',
+            'lineHeight': '60px',
+            'borderWidth': '1px',
+            'borderStyle': 'dashed',
+            'borderRadius': '5px',
+            'textAlign': 'center',
+            'margin': '10px'
+        }),
+    ], 
+    justify="center", align="center",style={'background-color': '#f8f9fa', 'padding': '20px', 'text-align': 'center'})