Renames the docs CTA tracking event from `cta_clicked` to
`try_for_free_clicked` to match the per-event custom event names used
on the marketing website, and uses a single `location` string property
in place of the previous `surface` / `variant` / `target` / `page_path`
shape. Surface identifiers are normalized to underscored snake_case to
match the location values already used on the website.
Same change applies to the docs navbar handler that fires when a
visitor clicks the Free Developer Access link.
Introduces a reusable OpsPlatformCTA component with four visual variants
(card, info, inline, tile) for placing dashboard sign-up calls-to-action
across the docs. Each click captures a `cta_clicked` PostHog event tagged
with surface, variant, and page path, and navigates to the dashboard with
UTM parameters identifying the source surface.
Registers the component in both MDX provider maps (home and integrations
slug routes) so it can be used in any MDX file.
Repoints the navbar "Free Developer Access" link to the dashboard and
wires the same PostHog tracking to its left and right placements.
Sam Julien