docs: link to the contact page instead of contact@lancedb.com

Carries over production's #360 (deploy-freeze 78d55c2) where it was only
partly ported. The navbar's Support link still opened
mailto:contact@lancedb.com, and the home page linked the contact page but
showed the email address as link text. Both now match production. The
other passages #360 changed are already ported at their new paths.

docs/web/docs.json

@@ -565,7 +565,7 @@
     "links": [
       {
         "label": "Support",
-        "href": "mailto:contact@lancedb.com"
+        "href": "https://www.lancedb.com/contact"
       }
     ]
   },

docs/web/index.mdx

@@ -105,8 +105,8 @@ for agents. Start here:
 [LanceDB Enterprise](/enterprise) is a petabyte-scale (and beyond), distributed **multimodal lakehouse** platform built for
 search, curation, feature engineering, and high-throughput training data access workflows on top of the same core table
 abstraction. This eliminates the need for teams to build bespoke infrastructure to manage large multimodal datasets.
-To set up LanceDB Enterprise in your organization, reach out to us at
-[contact@lancedb.com](https://www.lancedb.com/contact).
+To set up LanceDB Enterprise in your organization,
+[reach out to us](https://www.lancedb.com/contact).
 
 <Info>
 **Built with scale, performance, and security in mind.**