chore: rework tags for L3 pages

[mhaack]

Relates #391

Change to new single tag fields for tag usage on L3 pages:

• update hero for eyebrow and first tag
• update article tags
• update related article cards

Test URLs: Before: https://main--hlx-test--urfuwo.hlx.live/news/2020/02/sap-proaxia-intelligent-enterprise-solution-automotive-retail-sap-s-4hana

After: https://feat-391-tagging--hlx-test--urfuwo.hlx.live/news/2020/02/sap-proaxia-intelligent-enterprise-solution-automotive-retail-sap-s-4hana Test 2: https://feat-391-tagging--hlx-test--urfuwo.hlx.live/news/2020/02/sap-io-foundry-munich-cohort-acceleration-program-marketing-commerce-startups Test 3: https://feat-391-tagging--hlx-test--urfuwo.hlx.live/blog/2020/02/doehler-goodyear-intelligent-enterprise-sap-s4hana

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
• [ ] Re-sync branch

Commits

* [bfd1f26](https://github.com/urfuwo/hlx-test/commit/bfd1f269bf9300bfd92726b6fbf13c0a4f59625d) :white_check_mark: (latest) * [dde3b18](https://github.com/urfuwo/hlx-test/commit/dde3b18644565230914152babe72129bdd326a1e) :white_check_mark: * [bcb4dae](https://github.com/urfuwo/hlx-test/commit/bcb4daeb78a6113b648e4cf6f1340f69984de021) :white_check_mark:

[aem-code-sync[bot]]

Page	Scores	Audits	Google
/blog/2020/02/doehler-goodyear-intelligent-enterprise-sap-s4hana
/news/2020/02/sap-io-foundry-munich-cohort-acceleration-program-marketing-commer ce-startups
/news/2020/02/sap-proaxia-intelligent-enterprise-solution-automotive-retail-sap- s-4hana