v0.105.9

## What's Changed
* feat(website): new marketing website (Astro) with the agents landing page by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5440
* fix(website): robots.txt also advertises the proxied docs sitemap by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5447
* fix(website): bundle the PostHog init so analytics actually loads by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5449
* chore(docs): reposition copy to the agents workspace by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5448
* feat(api): align plan catalog with new pricing by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5445
* fix(website): landing meta description matches the site's own copy by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5452
* ci(website): preview skips Dependabot PRs and fires on ready_for_review by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5454
* feat(website): Introducing Agenta 2.0 — announcement post + hero tag by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5450
* fix(frontend): hide context-window meter from agent playground composer by @ashrafchowdury in https://github.com/Agenta-AI/agenta/pull/5460
* feat(frontend): create an agent from a website template deep link by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5423
* fix(frontend): tighten the app shell lines and the playground scrollbars by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5461
* [fix] Remove the redundant boolean annotation that fails TypeScript lint by @mmabrouk in https://github.com/Agenta-AI/agenta/pull/5462
* [release] v0.105.9 by @github-actions[bot] in https://github.com/Agenta-AI/agenta/pull/5446


**Full Changelog**: https://github.com/Agenta-AI/agenta/compare/v0.105.8...v0.105.9