Switch Contact Sales to Book a Demo in navbar (#1569)

* Switch Contact Sales to Book a Demo in navbar

- Change navbar button text from 'Contact Sales' to 'Book a Demo'
- Update button href to use REFLEX_DEV_WEB_LANDING_FORM_URL_GET_DEMO constant
- Import demo URL constant from pcweb.constants
- Button now links to Cal.com demo booking form instead of pricing page

Co-Authored-By: Alek <[email protected]>

* Fix navbar button to link to /pricing instead of Cal.com

- Revert href from REFLEX_DEV_WEB_LANDING_FORM_URL_GET_DEMO back to /pricing
- Remove unnecessary import of REFLEX_DEV_WEB_LANDING_FORM_URL_GET_DEMO
- Keep 'Book a Demo' button text as requested

Co-Authored-By: Alek <[email protected]>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Alek <[email protected]>

Author: devin-ai-integration[bot]

pcweb/components/docpage/navbar/navbar.py

@@ -530,7 +530,7 @@ def new_component_section() -> rx.Component:
             nav_menu.item(
                 rx.link(
                     button(
-                        "Contact Sales",
+                        "Book a Demo",
                         class_name="!h-8 !font-small-smbold !rounded-[0.625rem] whitespace-nowrap",
                     ),
                     underline="none",