refactoring (#178)

* unify components import

* refactor config and app context

* refactor icons

* refactor date, error, mxid and storage

* refactor synapse utils

src/utils/icons.ts

@@ -0,0 +1,16 @@
+import AnnouncementIcon from '@mui/icons-material/Announcement';
+import EngineeringIcon from '@mui/icons-material/Engineering';
+import HelpCenterIcon from '@mui/icons-material/HelpCenter';
+import SupportAgentIcon from '@mui/icons-material/SupportAgent';
+import OpenInNewIcon from '@mui/icons-material/OpenInNew';
+
+export const Icons = {
+  Announcement: AnnouncementIcon,
+  Engineering: EngineeringIcon,
+  HelpCenter: HelpCenterIcon,
+  SupportAgent: SupportAgentIcon,
+  Default: OpenInNewIcon,
+  // Add more icons as needed
+};
+
+export const DefaultIcon = Icons.Default;