docs(plugins): drop the donation-link and description-URL listing rule (#36291)

docs/reference/plugin-authoring.md

@@ -174,8 +174,7 @@ Warnings do not fail the check. Run it in CI for the plugin and catalog reposito
 A catalog is a Git repository with `orca-catalog.json` at its root that lists plugins and pins
 each release to an exact commit and file hash, so Orca refuses bytes the catalog did not vouch
 for. Plugins in Orca's official and community catalogs must follow the
-[plugin listing policy](plugin-listing-policy.md): free to use, no donation links, and no URLs in
-the description.
+[plugin listing policy](plugin-listing-policy.md), starting with being free to install and use.
 
 1. Commit the plugin and run `pnpm validate:plugin` on its directory. It prints the
    release entry for `HEAD`: version, full commit SHA, `contentHash`, execution profile, minimum

docs/reference/plugin-listing-policy.md

@@ -11,11 +11,6 @@ Orca doesn't support paid plugins yet. A listed plugin must be free to install a
 - No paywalls, license keys, trials, or features locked behind a purchase or subscription.
 - A plugin may connect to a paid service the user already has, such as their own API account.
 
-## No donation or sponsor links
-
-Don't add donation, sponsor or funding links to the manifest, the description or the plugin's
-UI. Don't put URLs in the description at all: Orca shows descriptions as plain text.
-
 ## Publisher is the repository owner
 
 `publisher` must be the GitHub or GitLab user or organization that owns the plugin's repository, the same