Add Developer.md and update favicons

DEVELOPER.md

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+# Details for Developers
+
+## Libraries
+
+### Next JS
+
+This app is built using Next.JS using the App Router structure.
+However, to avoid common issues with wallet integrations and SSR, the app is run entirely client-side, which the exception of the auto-stake-activation feature which is a backend API.
+
+### Wagmi + Viem + RainbowKit
+
+This app uses Viem as the engine for chain interaction, RainbowKit for wallet selection, and Wagmi to tie them together into React Hooks.
+
+### TailwindCSS + HeadlessUI + DaisyUI
+
+The app is styled almost entirely with TailwindCSS.
+It also uses some reusable components from Headless (e.g. for modals).
+And also DaisyUI for some theming and additional components.
+
+## Code structure
+
+- The pages are defined in the /src/app folder
+- Business logic such as chain queries and interactions are in /src/features
+- Generic, reusable components are in /src/components
+- Constants and configs are in /src/config
+
+## Runtime
+
+Currently the app is configured to be run on Vercel. However, since the app runs entirely client-side, it could be restructured to be served from more decentralized infra like Fleek or IPFS, although the auto-stake-activation feature would be tricky to port.

README.md

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-# **WORK IN PROGRESS**
-
-Everything is still very much in flux.
-
 # Celo Station
 
 Celo Station is a [DApp](https://en.wikipedia.org/wiki/Decentralized_application) for participating in staking and governance on [Celo](https://celo.org).
@@ -21,3 +17,5 @@ For support, you can [file an issue](https://github.com/jmrossy/celo-station/iss
 1. Install: `yarn`
 2. Setup: `yarn prepare`
 3. Run locally: `yarn dev`
+
+For more information about the architecture and internals of this app, see [DEVELOPER.md](./DEVELOPER.md).