enhance macos above 4.0 link generation

[hasezoey]

currently, macos versions are not shown in https://www.mongodb.org/dl/

tracking issue in mongodb jira: https://jira.mongodb.org/browse/DOCS-14560

[hasezoey]

Update Jan 2022: still no fix from mongodb's side

but i found a slight workaround, currently using the site Download, then selecting the wanted version and MacOs, there is a button called Copy Link which makes it quite easy to view the links for the version - but this still does not change the fact that the normal file index still does not show them

[hasezoey]

Update April 2022: still no fix and the mongodb jira issue seems to be gone

since the creation of this issue in jira it was transferred from DOCS to WEBSITE, but now the project "WEBSITE" does not exists anymore, see https://jira.mongodb.org/browse/DOCS-15234

[hasezoey]

since creation of this issue, the old way (https://www.mongodb.org/dl/) was removed and replaced with https://www.mongodb.com/download-center/community/releases/archive, which shows all urls in one place (including windows, linux, mac)