update readme and templates to clarify scope (#1437)

Co-authored-by: Juan Font <juanfontalonso@gmail.com>

.github/renovate.json

@@ -6,31 +6,27 @@
   "onboarding": false,
   "extends": ["config:base", ":rebaseStalePrs"],
   "ignorePresets": [":prHourlyLimit2"],
-  "enabledManagers": ["dockerfile", "gomod", "github-actions","regex" ],
+  "enabledManagers": ["dockerfile", "gomod", "github-actions", "regex"],
   "includeForks": true,
   "repositories": ["juanfont/headscale"],
   "platform": "github",
   "packageRules": [
     {
-        "matchDatasources": ["go"],
-        "groupName": "Go modules",
-        "groupSlug": "gomod",
-        "separateMajorMinor": false
+      "matchDatasources": ["go"],
+      "groupName": "Go modules",
+      "groupSlug": "gomod",
+      "separateMajorMinor": false
     },
     {
-        "matchDatasources": ["docker"],
-        "groupName": "Dockerfiles",
-        "groupSlug": "dockerfiles"
-    } 
+      "matchDatasources": ["docker"],
+      "groupName": "Dockerfiles",
+      "groupSlug": "dockerfiles"
+    }
   ],
   "regexManagers": [
     {
-      "fileMatch": [
-          ".github/workflows/.*.yml$"
-      ],
-      "matchStrings": [
-        "\\s*go-version:\\s*\"?(?<currentValue>.*?)\"?\\n"
-      ],
+      "fileMatch": [".github/workflows/.*.yml$"],
+      "matchStrings": ["\\s*go-version:\\s*\"?(?<currentValue>.*?)\"?\\n"],
       "datasourceTemplate": "golang-version",
       "depNameTemplate": "actions/go-version"
     }