[icons] docs: add many tags, word associations to icons metadata

[gabrieljroth]

Fixes #0000

Checklist

• Includes tests
• Update documentation

Changes proposed in this pull request:

Added tags to each icon.

Reviewers should focus on:

Tags were added to the file in the correct manner.

Screenshot

[palantirtech]

Thanks for your interest in palantir/blueprint, @gabrieljroth! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[adidahiya]

Hey @gabrieljroth, I haven't forgotten about this PR, it's just very large and will take a while to review. I've looked through the first 300 lines and this is my feedback so far, but I'm sure I will have more feedback for the rest of the changes. If you want to merge these changes sooner, you can break this down into smaller PRs. Otherwise, you can wait until I'm able to review the whole thing here.

[gabrieljroth]

@adidahiya, thanks for reviewing the first chunk of the updates! I removed the quotations, the brackets, and any tag that was redundant with the Icon name. I also removed specific tags as per your comments (except ones where I disagreed per my replies).

[adidahiya]

reviewed up to line 900

[adidahiya]

reviewed up to line 1600

[adidahiya]

reviewed up to line 2100

[adidahiya]

reviewed from line 2100 to the end

[gabrieljroth]

Accepted almost all suggestions, left a few comments.