docs: upgrade theme

[codecov[bot]]

Codecov Report

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

Project coverage is 70.21%. Comparing base (9b2bd8c) to head (a19eca5).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #337 +/- ## ======================================= Coverage 70.21% 70.21% ======================================= Files 119 119 Lines 12029 12029 ======================================= Hits 8445 8445 Misses 3194 3194 Partials 390 390 ``` | [Flag](https://app.codecov.io/gh/creativeprojects/resticprofile/pull/337/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fred) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/creativeprojects/resticprofile/pull/337/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fred) | `70.21% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Fred#carryforward-flags-in-the-pull-request-comment) to find out more.

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