docs(action): specify docs (#4709)

* docs: add actions section

* docs(actions): add modules

* docs: actions

* docs(actions): start with register flows

* add calls

* docs: all actions documented

* docs(actions): unify

* docs(actions): unify texts

* docs: apply suggestions from code review

Co-authored-by: mffap <mpa@zitadel.com>

* docs(actions): clarifications

* docs: return values italic

* docs: fix broken links

* docs: fix broken links

* docs: fix broken links

* docs: fix broken links

* Update docs/docs/apis/actions/introduction.md

Co-authored-by: mffap <mpa@zitadel.com>

* docs(actions): link actions examples

* docs: remove unused section

Co-authored-by: mffap <mpa@zitadel.com>
Co-authored-by: Florian Forster <florian@zitadel.com>

docs/sidebars.js

@@ -228,7 +228,6 @@ module.exports = {
           collapsed: true,
           items: ["apis/assets/assets"],
         },
-        "apis/actions",
       ],
     },
     {
@@ -249,6 +248,18 @@ module.exports = {
       collapsed: false,
       items: ["apis/saml/endpoints"],
     },
+    {
+      type: "category",
+      label: "Actions",
+      collapsed: false,
+      items: [
+        "apis/actions/introduction",
+        "apis/actions/modules",
+        "apis/actions/login-flow",
+        "apis/actions/register-flow",
+        "apis/actions/objects",
+      ]
+    },
     {
       type: "category",
       label: "Observability",