[FW][IMP] barcode: split docs + hone in on language

[fw-bot]

Summary

Improve wording about GS1 barcode concepts.

• Received feedback from CRU about barcode conceptual accuracy and changed the wording to reflect it
• Created scannable 2D matrix barcodes (they look like QR codes) for readers to try scanning!
• Received feedback from hojo to split the docs into two so it's easier for readers to search for GS1 nomenclature (setup) vs. using GS1 barcodes in their warehouse workflow.
• Received feedback from ZST about honing in on language surrounding creating GS1 barcodes. Need to make it very clear that Odoo doesn't generate GS1 barcodes for users! We just take in their inputs. Can reviewers make sure that my doc makes this very clear? (:

Thanks 😸

Forward-Port-Of: #6492
Forward-Port-Of: #5592

[robodoo]

Pull request status dashboard.

[fw-bot]

This PR targets saas-16.4 and is part of the forward-port chain. Further PRs will be created up to master.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port

[robodoo]

@Felicious @StraubCreative staging failed: ci/runbot on 3d1021b1c65f8be13f4041d57b98a3e09559fae5 (view more at https://runbot.odoo.com/runbot/build/53882914)

[StraubCreative]

@robodoo retry

[robodoo]

@Felicious @StraubCreative staging failed: ci/runbot on 3eff291ec18cd25581fd3ff8143a0f9ac9c89ab5 (view more at https://runbot.odoo.com/runbot/build/53893786)

[StraubCreative]

@robodoo retry

[robodoo]

@Felicious @StraubCreative staging failed: ci/runbot on 8fa803225037b99b24c0802cb2596d4188054aba (view more at https://runbot.odoo.com/runbot/build/53920206)

[d-fence]

robodoo retry
Failing test unreviewed