feat: Add event collection and event page structure

- Introduced a new events collection in config.ts with schema validation.
- Created a new event markdown file for the WarGear event.
- Updated German translations to include new event-related strings.
- Modified PageLayout to support a wide layout option.
- Enhanced announcements page to improve tag filtering and post rendering.
- Implemented dynamic event pages with detailed event information and fight plans.
- Added an index page for events to list all upcoming events.

src/components/Navbar.svelte

@@ -81,6 +81,7 @@
                 </button>
                 <div>
                     <a class="btn btn-gray" href={l("/announcements")}>{t("navbar.links.home.announcements")}</a>
+                    <a class="btn btn-gray" href={l("/events")}>{t("navbar.links.home.events")}</a>
                     <a class="btn btn-gray" href={l("/downloads")}>{t("navbar.links.home.downloads")}</a>
                     <a class="btn btn-gray" href={l("/faq")}>{t("navbar.links.home.faq")}</a>
                     <a class="btn btn-gray" href={l("/code-of-conduct")}>{t("navbar.links.rules.coc")}</a>