Update Standards and Policies links

[indrajit-gsa]

Description of Issue:

The links in the Standards and Policies will need updates.

Details of Issue:

Some of the document links are outdated, some point to the wrong repositories (OMB memoranda), and some links are broken.

References (Docs, Links, Files):

https://arch.idmanagement.gov/standards/
The updates to the links will be provided.

If a New Page or Content is Needed, Expected Outcomes:

Verify that the links that are updated with new ones.

Link to the Content Page for Contributors:

https://github.com/GSA/ficam-arch/blob/staging/pages/ficam_standards_policies.md

[indrajit-gsa]

Preview link for the Standards & Policies page:
https://federalist-proxy.app.cloud.gov/preview/gsa/ficam-arch/15-links/standards/