fix(tika): adapt to Gotenberg 7 API

This commit adapts to the latest breaking changes from Gotenberg 7.
It also freezes the usage of the Gotenberg server to v7.x. Doing
this prevents further breaking changes leaking in our code base.

* refs #1250

docs/configuration.rst

@@ -402,7 +402,7 @@ Tika settings
 #############
 
 Paperless can make use of `Tika <https://tika.apache.org/>`_ and
-`Gotenberg <https://thecodingmachine.github.io/gotenberg/>`_ for parsing and
+`Gotenberg <https://gotenberg.dev/>`_ for parsing and
 converting "Office" documents (such as ".doc", ".xlsx" and ".odt"). If you
 wish to use this, you must provide a Tika server and a Gotenberg server,
 configure their endpoints, and enable the feature.
@@ -444,10 +444,10 @@ requires are as follows:
         # ...
 
         gotenberg:
-            image: thecodingmachine/gotenberg
+            image: gotenberg/gotenberg:7
             restart: unless-stopped
             environment:
-                DISABLE_GOOGLE_CHROME: 1
+                CHROMIUM_DISABLE_ROUTES: 1
 
         tika:
             image: apache/tika