Fix shell prompts in README

Author: haglobah

README.md

@@ -10,29 +10,29 @@ Written in [Racket](https://racket-lang.org) and [Pollen](https://pollenpub.com)
 The easiest way to get started with local development is to [use Nix](https://zero-to-nix.com/start/install):
 
 1. Install Nix
-```bash
+```shell
 curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
 ```
 2. Fork this repo
 3. Enter the nix development environment (from inside the repo):
-```bash
+```shell
 cd functional-coders.github.io && nix develop
 ```
 4. Run the project server
-```bash
+```shell
 raco pollen start
 ```
 5. edit files, reload the browser window, see the changes
 
 ## 2) 'Normal' install
 1. Download & Install [Racket](https://racket-lang.org): [download.racket-lang.org](https://download.racket-lang.org)
 2. Install [Pollen](https://pollenpub.com):
-```
-λ raco pkg install --auto --skip-installed pollen racket-langserver string-interpolation
+```shell
+raco pkg install --auto --skip-installed pollen racket-langserver string-interpolation
 ```
 3. Fork this repo.
 4. Start Pollens' project server from the project root:
-```
-λ raco pollen start 
+```shell
+raco pollen start 
 ```
 5. edit some file; reload your browser window; see the change.