Update index.md

Fixed grammatical error on ideas page.

ideas/index.md

@@ -9,7 +9,7 @@ bodyclass: ideas
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 <p>
-We have a great list of ideas that we to work on &ndash; including tools, apps, visualizations and investigations! <strong>Anyone can start working on these &ndash; please jump in!</strong>
+We have a great list of ideas that we are working on &ndash; including tools, apps, visualizations and investigations! <strong>Anyone can start working on these &ndash; please jump in!</strong>
 </p>
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 We track our ideas <a href="https://github.com/okfn/ideas/issues">using github issues</a> and below we have an overview courtesy of waffle.io. There's <a href="https://github.com/okfn/ideas/issues?labels=Effort%3A+%E2%98%85">also a short list of the ideas which are easy to get started with</a>.