Fix plugin detail rating

[Xpirix]

• This is a fix for #354

Change summary

• Use the decimal rating value in the plugin detail page
• Add new images for ratings display: quarter, half, three-quarters
• Change the rating star fill according to the rating value

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (998e0b5) 36.06% compared to head (cb31a20) 36.08%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #359 +/- ## ========================================== + Coverage 36.06% 36.08% +0.01% ========================================== Files 111 111 Lines 4899 4900 +1 ========================================== + Hits 1767 1768 +1 Misses 3132 3132 ```

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