Rename references to "Pubcommon" to "Sharedid"

[jdwieland8282]

Companion Issue to pb.js issue prebid/Prebid.js#6640

[jdwieland8282]

Note:

• userId.html references "PubCommon" 59 times
• download.md references "PubCommon" once
• prebid-server/endpoints/openrtb2/pbs-endpoint-auction.md references "PubCommon" once
• dev-docs/requirements/tcf2/PrebidSupportforEnforcingTCF2.html references "PubCommon" once

[jdwieland8282]

#2904

[jdwieland8282]

Add a link to the wordpress and drupal repos on https://github.com/prebid/prebid.github.io/tree/user-section

• wordpress:https://github.com/prebid/pubcommon-wordpress
• drupal:https://github.com/prebid/pubcommon-drupal

[jdwieland8282]

move the content on: https://publishersupport.conversantmedia.com/products/pubcid-pubs#serve
to: https://github.com/prebid/prebid.github.io/tree/user-section

[bretg]

@jdwieland8282 - are we good with this issue? There's no reference to drupal in docs.prebid.org.

[jdwieland8282]

Those features are mentioned on docs.prebid.org/identity/sharedid.html