Fix fundamentals & updates link on /web landing (google#3859)

Adds offline UX guide (google#3845)

* Adding offline UX guide article

* added changes

* Copy edit, part I.

* Copy edit, part II.

* updated title

* adding line breaks at 80 chars and updating the title

* Move to offline

Adding new credential management docs (google#3849)

* Adding new credential management docs

* Changed titles in TOC to match doc titles

* More clean-up of about and retrieve pages.

* Cleaned up store cred doc

* Copy edit about-credential-management-api.md.

* Copy edit retrieve-credentials.md.

* Copy edit store-credentials.md.

* Fix caption formatting in about-credential-management-api.md.

* Pete's edits

* code wrap

* edited with Eiji

Update README.md

One comment on the shows will-transform change

Correct Typos in SVGOMG Spotlight