Add option for expanding changelog entries

[terror]

This PR adds the ability for users to click 'Show all' or 'Show less' on the changelog page, we restrict the amount of entries shown per month to 5 so as to not clutter the page.

[codecov[bot]]

Codecov Report

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

Project coverage is 86.10%. Comparing base (fd49165) to head (85bf4fb).

:exclamation: Current head 85bf4fb differs from pull request most recent head 104eb9f

Please upload reports for the commit 104eb9f to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #583 +/- ## ======================================= Coverage 86.10% 86.10% ======================================= Files 45 45 Lines 6441 6441 ======================================= Hits 5546 5546 Misses 895 895 ```

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