Remove confusing (myvenv) from pythonanywhere prompt

When you navigate into the project directory
at that point of the tutorial in pythonanywhere you
actually see something along the lines of:

```
(myvenv) somestuffhere (master)$
```

I think it's simpler to not have the `(myvenv)`
part at all (since it's not needed/relevant in that step)
and only have what people need to type in.

en/html/README.md

@@ -179,7 +179,7 @@ Once we've done that, we upload (push) our changes up to Github:
 
 ```
 $ cd ~/my-first-blog
-(myvenv)$ git pull
+$ git pull
 [...]
 ```