chore: rework plugin readmes, json changelogs and standalone repo setup

plugins/file-manager/CHANGELOG.json

@@ -0,0 +1,34 @@
+{
+  "$schema": "https://raw.githubusercontent.com/Termix-SSH/Termix/main/packages/plugin-sdk/schema/changelog.schema.json",
+  "releases": [
+    {
+      "version": "1.0.0",
+      "changes": [
+        {
+          "type": "added",
+          "text": "Browse, upload, download, rename, move and delete files, with sudo support"
+        },
+        {
+          "type": "added",
+          "text": "Edit files in a built-in code editor"
+        },
+        {
+          "type": "added",
+          "text": "Preview images, PDFs, audio and video"
+        },
+        {
+          "type": "added",
+          "text": "A trash you can restore deleted files from"
+        },
+        {
+          "type": "added",
+          "text": "Copy files between two hosts, with the fastest route picked for you and an integrity check"
+        },
+        {
+          "type": "added",
+          "text": "A side by side local and remote view in the desktop app"
+        }
+      ]
+    }
+  ]
+}