feat: add max upload size setting to UI & UI improvements (#1646)

* Add preliminar Windows support for both
development and production environments.

Default profile.Data will be set to "C:\ProgramData\memos" on Windows.
Folder will be created if it does not exist, as this behavior is
expected for Windows applications.

System service installation can be achieved with third-party tools,
explained in docs/windows-service.md.

Not sure if it's worth using https://github.com/kardianos/service
to make service support built-in.

This could be a nice addition alongside #1583 (add Windows artifacts)

* feat: improve Windows support

- Fix local file storage path handling on Windows

- Improve Windows dev script

* feat: add max upload size setting to UI & more

- feat: add max upload size setting to UI

- feat: max upload size setting is checked on UI during upload,
but also enforced by the server

- fix: overflowing mobile layout for Create SSO, Create Storage
and other Settings dialogs

- feat: add HelpButton component with some links to docs were appropriate

- remove LearnMore component in favor of HelpButton

- refactor: change some if/else to switch statements

- refactor: inline some err == nil checks

! Existing databases without the new setting 'max-upload-size-mib'
will show an upload error, but this can be user-fixed by simply
setting the value on system settings UI.

* improvements requested by @boojack

store/system_setting.go

@@ -94,6 +94,15 @@ func (s *Store) FindSystemSetting(ctx context.Context, find *api.SystemSettingFi
 	return systemSettingRaw.toSystemSetting(), nil
 }
 
+func (s *Store) GetSystemSettingValueOrDefault(ctx *context.Context, find api.SystemSettingName, defaultValue string) string {
+	if setting, err := s.FindSystemSetting(*ctx, &api.SystemSettingFind{
+		Name: find,
+	}); err == nil {
+		return setting.Value
+	}
+	return defaultValue
+}
+
 func upsertSystemSetting(ctx context.Context, tx *sql.Tx, upsert *api.SystemSettingUpsert) (*systemSettingRaw, error) {
 	query := `
 		INSERT INTO system_setting (
@@ -127,7 +136,7 @@ func findSystemSettingList(ctx context.Context, tx *sql.Tx, find *api.SystemSett
 	query := `
 		SELECT
 			name,
-		  value,
+			value,
 			description
 		FROM system_setting
 		WHERE ` + strings.Join(where, " AND ")