[pinterest] only mention cookies for authentication (#1856)

regular login is broken due to CAPTCHA

README.rst

@@ -212,7 +212,6 @@ and optional for
 ``mangadex``,
 ``mangoxo``,
 ``pillowfort``,
-``pinterest``,
 ``sankaku``,
 ``subscribestar``,
 ``tapas``,

docs/configuration.rst

@@ -372,7 +372,6 @@ Description
     * ``mangadex``
     * ``mangoxo``
     * ``pillowfort``
-    * ``pinterest``
     * ``sankaku``
     * ``subscribestar``
     * ``tapas``

docs/supportedsites.md

@@ -557,7 +557,7 @@ Consider all sites to be NSFW unless otherwise known.
     <td>Pinterest</td>
     <td>https://www.pinterest.com/</td>
     <td>Pins, pin.it Links, related Pins, Search Results, Sections, User Profiles</td>
-    <td>Supported</td>
+    <td><a href="https://github.com/mikf/gallery-dl#cookies">Cookies</a></td>
 </tr>
 <tr>
     <td>Pixhost</td>

scripts/supportedsites.py

@@ -229,7 +229,7 @@ AUTH_MAP = {
     "patreon"        : _COOKIES,
     "pawoo"          : _OAUTH,
     "pillowfort"     : "Supported",
-    "pinterest"      : "Supported",
+    "pinterest"      : _COOKIES,
     "pixiv"          : _OAUTH,
     "ponybooru"      : "API Key",
     "reddit"         : _OAUTH,