v2.4.0 release announcement (#3526)

website/release_announcement_drafts/v2.4.0.md

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+Hello all! We are excited to announce the new features in this release. Here are
+some highlights
+
+## More theme options and dark mode
+
+The jbrowse web and jbrowse desktop app now has multiple themes that a user can
+pick between in the jbrowse-web and jbrowse-desktop apps.
+
+Extra themes can be defined via plugins or via your config file.
+
+See [the theme docs](/docs/config_guides/theme) for more info and let us know if
+you have any requests
+
+![](https://user-images.githubusercontent.com/6511937/221064203-d19352fe-915a-41bc-9ec3-dc22ae94c40f.png)
+
+## SVG export of more view types
+
+Dotplot, circular, and linear synteny views have added an SVG export option. The
+breakpoint split view is one of the few view types without the SVG export now.
+The SVG exports can incorporate the current theme, or use a default.
+
+![](https://user-images.githubusercontent.com/6511937/221062560-346cc4e7-1053-496f-80a8-bded420041a7.png)
+
+See the release notes for more!