use environment variables for SHARE URLs

[aaxelb]

• Ticket: []
• Feature flag: n/a

Purpose

make it easier to run SHARE with OSF locally

Summary of Changes

• update the registries discover page to use config instead of hard-coded URLs
• update the collections discover page to stop referencing config it does not use

Screenshot(s)

Side Effects

QA Notes

[coveralls]

Pull Request Test Coverage Report for Build 4767184875

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 72.45%

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Totals
Change from base Build 4680403816:	0.006%
Covered Lines:	5735
Relevant Lines:	7701

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💛 - Coveralls