Add "caption-side" CSS depending on whether the caption is below or above table

[FelisDiligens]

Description

Currently, whether a caption is placed above or below the table in Markdown isn't really taken into account. The resulting caption stays on top.

This pull request adds a style attribute to the <caption> tag, containing caption-side: bottom, if the caption is placed below the table.
(The default value of caption-side is top, which is why I chose to omit it. See MDN)

I also updated the test fixtures to include the style attribute.

Please let me know, if there's something wrong with the PR.

Examples

| Example table ||
|----------------|
|  Foo  |  Bar   |
[Caption below]

Results in

[Caption above]
| Example table ||
|----------------|
|  Foo  |  Bar   |

Results in

[coveralls]

Pull Request Test Coverage Report for Build 4476942550

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 4427271110:	0.0%
Covered Lines:	235
Relevant Lines:	235

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💛 - Coveralls

[redbug312]

Thank you and the PR looks good. I'll merge it later in v4.2.2.