chore: update links to correct URLs in package.json

[Validark]

Updated the package.json files to reflect the move to the monorepo. Note: I did not update the versions of the package.json files. I presume that would happen immediately before pushing to npm?

Issue being fixed or feature implemented

Helps npm point to the right location

What was done?

Updated links in the package.json files. In each package.json file:

• "repository.url" was set to "git+https://github.com/dashpay/platform.git"
• "bugs.url" was set to "https://github.com/dashpay/platform/issues"
• "homepage" was set to the directory of the package

How Has This Been Tested?

n/a

Breaking Changes

none

Checklist:

• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or updated relevant unit/integration/functional/e2e tests
• [ ] I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• [ ] I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• [ ] I have assigned this pull request to a milestone

[Validark]

Are the homepages supposed to point to the v1.1-dev branch? Not really sure what to do about that.

[lklimek]

Are the homepages supposed to point to the v1.1-dev branch? Not really sure what to do about that.

Maybe HEAD, for example https://github.com/dashpay/platform/tree/HEAD/packages/dashpay-contract#readme ?