Add capabilities to task drivers' pages

[kobayashi]

This add table of capabilities to each task driver page. #8402

[hashicorp-cla]

All committers have signed the CLA.

[tgross]

Thanks for this contribution @kobayashi! I took a look at the preview deploys (ex. docker) and the layout looks great.

Can you provide a sentence with a link to the API docs at the top of each capabilities section? Maybe something like:

The X task driver implements the following capabilities

And then for the Implementation side of the table, we'd rather have a plain English version of the enums. So for example, instead of FSIsolationImage, just image is fine. These are operator docs rather than plugin developer docs, so having that is a little more user-friendly.

[tgross]

On Linux the Java capabilities are slightly different: https://github.com/hashicorp/nomad/blob/v0.12.0/drivers/java/driver.go#L98-L101

[tgross]

Should be chroot: https://github.com/hashicorp/nomad/blob/v0.12.0/drivers/exec/driver.go#L82

[tgross]

We should include MustInitiateNetwork | false everywhere it's not explicitly set to true by default.

[tgross]

We should include | NetIsolationModes | none | here

[kobayashi]

Thank you for the review @tgross !
I just modified tables.

[tgross]

LGTM

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