Issue template enhancements

- Moved steps to reproduce to the top
- Added explicit quota + encryption questions
- Added boldening of entries for readability

Here is a preview of the enhanced template:

### Steps to reproduce
1.
2.
3.

### Expected behaviour
Tell us what should happen

### Actual behaviour
Tell us what happens instead

### Server configuration
**Operating system**:

**Web server:**

**Database:**

**PHP version:**

**ownCloud version:** (see ownCloud admin page)

**Updated from an older ownCloud or fresh install:**

**List of activated apps:**

**The content of config/config.php:**

```
Insert your config.php content here
(Without the database password and passwordsalt)
```

**Are you using external storage, if yes which one:** local/smb/sftp/...

**Are you using quota:** yes/no

**Are you using encryption:** yes/no

### Client configuration
**Browser:**

**Operating system:**

### Logs
#### Web server error log
```
Insert your webserver log here
```

#### ownCloud log (data/owncloud.log)
```
Insert your ownCloud log here
```

#### Browser log
```
Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...
```


Please review @karlitschek @DeepDiver1975 @jancborchardt @schiesbn