chore: readme: updates size badges

[dkilgore-eightfold]

SUMMARY:

img.badgesize.io is down indefinitely due to it's domain being expired. Not sure if it'll ever be live again.

Move to use static badges for now with urls.

GITHUB ISSUE (Open Source Contributors)

https://github.com/ngryman/badge-size/issues/113

JIRA TASK (Eightfold Employees Only):

N/A

CHANGE TYPE:

• [x] Bugfix Pull Request
• [ ] Feature Pull Request

TEST COVERAGE:

N/A

TEST PLAN:

Open the badge urls using a browser.

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