Add release announcement drafts

website/release_announcement_drafts/v1.1.0.md

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+I'm pleased to announce a new release of JBrowse Web!
+
+We now use jexl to express configuration callbacks. This is technically a
+breaking change to use jexl for configuration callbacks instead of javascript.
+
+See our configuration guide here for details
+([configuration guide](docs/config_guide#configuration-callbacks))
+
+We also have several other improvements including the ability to get intron and
+upstream/downstream sequence in the feature details
+
+![](https://user-images.githubusercontent.com/6511937/111727694-c5570b80-8841-11eb-89b6-695b7b7a3379.png)