chore(manager): 📄 re-generate dependency licenses (#1305)

Our [`licenses.txt`](508a5a2af5/src/server_manager/web_app/ui_components/licenses/licenses.txt) file for Outline Manager is not correct, it is just a simple duplication of the [`README.md`](508a5a2af5/src/server_manager/README.md). In this PR, I re-generate the `licenses.txt` file with all dependencies and update the steps in order to correctly generate it.

src/server_manager/web_app/ui_components/licenses/README.md

@@ -4,12 +4,18 @@
 
 - `cd` to the root of your clone of this repo
 - Ensure `node_modules` is up to date and only include dependencies of the Electron app by running `npm ci && npm run action server_manager/web_app/build`
+- Copy `LICENSE` and the entire `node_modules` folder to `./src/server_manager/LICENSE` and `./src/server_manager/node_modules`
 - `cd src/server_manager`
 - `npx generate-license-file --input package.json --output web_app/ui_components/licenses/licenses.txt`
 - `cd web_app/ui_components/licenses`
 - `cat db-ip_license.txt >> licenses.txt`
 
-Done!
+Done! (remember to delete the `./src/server_manager/node_modules` folder)
+
+> Note that the third step of copying `LICENSE` and `node_modules` is required because:
+>
+> - `generate-license-file` iterates all dependencies under `node_modules` folder in the current directory
+> - `generate-license-file` will try to find a `LICENSE` file in the current directory, if not found, it will use `README.md` instead which is not what we want
 
 ## Check