refactor AboutCommand into own file

AboutCommand.py

@@ -0,0 +1,24 @@
+from textual.command import DiscoveryHit, Provider, Hits, Hit
+
+class AboutCommand(Provider):
+    '''Class to represent the About command in the menu'''
+
+    async def discover(self) -> Hits:
+        yield DiscoveryHit(
+                display='About',
+                command=self.app.action_toggle_sidebar,
+                help='Link to repo etc.'
+        )
+
+    async def search(self, query: str) -> Hits:
+        '''Called when the search functionality is used'''
+        matcher = self.matcher(query)
+        command = "About"
+        score = matcher.match(command)
+        if score > 0: 
+            yield Hit(
+                    score,
+                    matcher.highlight(command),
+                    self.app.action_toggle_sidebar,
+                    'Link to repo etc.'
+            )

bingo.py

@@ -4,12 +4,12 @@ from textual.app import App, ComposeResult
 from textual.widgets import Header, Input, Static, Button 
 from textual.containers import Horizontal, Container
 from textual.validation import Number
-from textual.command import DiscoveryHit, Provider, Hits, Hit
 from textual.reactive import reactive
 
 from datetime import datetime
 
 from BingoBoard import BingoBoard
+from AboutCommand import AboutCommand
 
 MESSAGE = '''
 Be excellent to each other!
@@ -23,23 +23,6 @@ Built using [@click="app.open_link('https://textual.textualize.io/')"]Textual[/]
 
 '''
 
-class AboutCommand(Provider):
-    '''Class to represent the About command in the menu'''
-
-    async def discover(self) -> Hits:
-        yield DiscoveryHit(display='About', command=self.app.action_toggle_sidebar, help='Link to repo etc.')
-
-    def show_about(self) -> None:
-        pass
-
-    async def search(self, query: str) -> Hits:
-        '''Called when the search functionality is used'''
-        matcher = self.matcher(query)
-        command = "About"
-        score = matcher.match(command)
-        if score > 0: 
-            yield Hit(score, matcher.highlight(command), self.app.action_toggle_sidebar, 'Link to repo etc.')
-
 class Sidebar(Container):
     '''Class to represent the sidebar'''