fix(alerting): Make Microsoft Teams title customizable (#731)

* Teams Custom Title

* Update README.md

* Small adjustment

---------

Co-authored-by: TwiN <twin@linux.com>

alerting/provider/teams/teams.go

@@ -21,6 +21,9 @@ type AlertProvider struct {
 
 	// Overrides is a list of Override that may be prioritized over the default configuration
 	Overrides []Override `yaml:"overrides,omitempty"`
+	
+	// Title is the title of the message that will be sent
+	Title string `yaml:"title,omitempty"`
 }
 
 // Override is a case under which the default integration is overridden
@@ -105,9 +108,12 @@ func (provider *AlertProvider) buildRequestBody(endpoint *core.Endpoint, alert *
 		Type:       "MessageCard",
 		Context:    "http://schema.org/extensions",
 		ThemeColor: color,
-		Title:      "🚨 Gatus",
+		Title:      provider.Title,
 		Text:       message + description,
 	}
+	if len(body.Title) == 0 {
+		body.Title = "🚨 Gatus"
+	}
 	if len(formattedConditionResults) > 0 {
 		body.Sections = append(body.Sections, Section{
 			ActivityTitle: "Condition results",