docs: swapped starter cloud links for enterprise (HumanSignal#6046)

### PR fulfills these requirements
- [ ] Commit message(s) and PR title follows the format
`[fix|feat|ci|chore|doc]: TICKET-ID: Short description of change made`
ex. `fix: DEV-XXXX: Removed inconsistent code usage causing intermittent
errors`
- [ ] Tests for the changes have been added/updated (for bug
fixes/features)
- [ ] Docs have been added/updated (for bug fixes/features)
- [ ] Best efforts were made to ensure docs/code are concise and
coherent (checked for spelling/grammatical errors, commented out code,
debug logs etc.)
- [ ] Self-reviewed and ran all changes on a local instance (for bug
fixes/features)



#### Change has impacts in these area(s)
_(check all that apply)_
- [ ] Product design
- [ ] Backend (Database)
- [ ] Backend (API)
- [ ] Frontend



### Describe the reason for change
_(link to issue, supportive screenshots etc.)_



#### What does this fix?
_(if this is a bug fix)_



#### What is the new behavior?
_(if this is a breaking or feature change)_



#### What is the current behavior?
_(if this is a breaking or feature change)_



#### What libraries were added/updated?
_(list all with version changes)_



#### Does this change affect performance?
_(if so describe the impacts positive or negative)_



#### Does this change affect security?
_(if so describe the impacts positive or negative)_



#### What alternative approaches were there?
_(briefly list any if applicable)_



#### What feature flags were used to cover this change?
_(briefly list any if applicable)_



### Does this PR introduce a breaking change?
_(check only one)_
- [ ] Yes, and covered entirely by feature flag(s)
- [ ] Yes, and covered partially by feature flag(s)
- [ ] No
- [ ] Not sure (briefly explain the situation below)



### What level of testing was included in the change?
_(check all that apply)_
- [ ] e2e
- [ ] integration
- [ ] unit



### Which logical domain(s) does this change affect?
_(for bug fixes/features, be as precise as possible. ex. Authentication,
Annotation History, Review Stream etc.)_

docs/themes/v2/layout/page.ejs

@@ -24,8 +24,8 @@
       </div>
     <% } %>
     <div class="toc-enterprise-cta">
-      <span class="toc-enterprise-cta-copy">Try Starter Cloud for free</span>
-      <%- partial("component/button", { url: "https://humansignal.com/platform/starter-cloud", label: "Get Started", theme: "Tertiary" }) %>
+      <span class="toc-enterprise-cta-copy">Try Enterprise for free</span>
+      <%- partial("component/button", { url: "https://humansignal.com/contact-sales", label: "Get Started", theme: "Tertiary" }) %>
     </div>
   </div>
 </div>