Improve page take 2

@arjun

docs/about.md

@@ -40,6 +40,11 @@ All you wanted to know about GHCup.
 * [haskell.org](https://www.haskell.org/haskell-org-committee/) via CI and infrastructure
 * [Haskell Foundation](https://haskell.foundation/affiliates/) via affiliation
 
+## How to help
+
+* if you are a developer, check out the [issue tracker](https://gitlab.haskell.org/haskell/ghcup-hs/-/issues) and the [Development guide](./dev.md)
+* if you want to donate to the project, visit our [opencollective](https://opencollective.com/ghcup#category-CONTRIBUTE) page
+
 ## Design goals
 
 1. simplicity

[Arjun Kathuria]

This could use a little politer wording, something like:-

1. If you are a developer, you can help the project out by looking at and help solve some of the currently open issues HERE (insert link)

2. You can also help us write clearer and more succinct documentation.

3. let us know the features you would like to see in the project and the motivations behind them.

4. You can also help the project in other ways, like donating to the project (link / button) here.

expand on whichever you see fit : )