Rename Service to Endpoint (#192)

* Add clarifications in comments

* #191: Rename Service to Endpoint

examples/kubernetes/gatus.yaml

@@ -1,8 +1,12 @@
 apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: gatus
+  namespace: kube-system
 data:
   config.yaml: |
     metrics: true
-    services:
+    endpoints:
       - name: website
         url: https://twin.sh/health
         interval: 1m
@@ -27,10 +31,6 @@ data:
         url: https://example.com/
         conditions:
           - "[STATUS] == 200"
-kind: ConfigMap
-metadata:
-  name: gatus
-  namespace: kube-system
 ---
 apiVersion: apps/v1
 kind: Deployment