chore(webapp): Clarify README.md

In particular, how to run the `webapp` with and without TLS. And where
to find the website based on that.

Author: luckysori

webapp/README.md

@@ -1,4 +1,4 @@
-# A simple webfrontend to be self-hosted
+# A simple web frontend to be self-hosted
 
 ## Run frontend only in dev mode
 
@@ -7,31 +7,43 @@ cd frontend
 flutter run -d chrome
 ```
 
-## Build the frontend to be served by rust
+## Build the frontend to be served by Rust
 
 ```bash
 flutter build web
 ```
 
-## Run the rust app
+## Run the Rust app
+
+### With TLS
+
+```bash
+cargo run -- --cert-dir certs --data-dir ../data --secure
+```
+
+The web interface will be reachable under `https://localhost:3001`.
+
+### Without TLS
 
 ```bash
 cargo run -- --cert-dir certs --data-dir ../data
 ```
 
-The webinterface will be reachable under `https://localhost:3001`
+The web interface will be reachable under `http://localhost:3001`
+
+### Troubleshooting
 
-Note: if you can't see anything, you probably forgot to run `flutter build web` before
+If you can't see anything, you probably forgot to run `flutter build web` before.
 
-## How to use curl with webapp
+## How to interact with the backend with `curl`
 
-We need to store cookies between two curl calls, for that you can use the cookie jar of curl:
+We need to store cookies between `curl` calls. For that you can use the `curl`'s cookie jar:
 
 ```bash
 curl -b .cookie-jar.txt -c .cookie-jar.txt -X POST http://localhost:3001/api/login -d '{ "password": "satoshi" }' -H "Content-Type: application/json" -v
 ```
 
-This will read and store the cookies in `.cookie-jar.txt`. So on the next call you can reference it the same way, e.g.
+This will read and store the cookies in `.cookie-jar.txt`. So on the next call you can reference it the same way:
 
 ```bash
 curl -b .cookie-jar.txt -c .cookie-jar.txt http://localhost:3001/api/balance