Commerce: Updated some articles

[eshanrnh]

Description

• Updated installation article to match our style guide.
• Renamed Introduction article to Requirements article.
• Moved the Requirements article from the Getting Started section to the Installation section.
• Added redirect for the introduction article since the name and path have been changed.
• Moved Tutorials section at the end of the Summary file (Since it's an empty section it doesn't make sense to have it before the Reference section).
• Added WIP Note in Tutorials article.

Type of suggestion

• Typo/grammar fix
• Updated outdated content
• New content
• Updates related to a new version
• Other

Product & version (if relevant)

Commerce v14

Deadline (if relevant)

Anytime

[sofietoft]

Looks good @eshanrnh 💪

I've added a couple of comments.
Regarding the restructure - I'm not sure whether it makes sense, it was just an idea that came to me, as I went through your PR!

[eshanrnh]

Thanks for your review, @sofietoft 💪I've made the necessary structure changes. Let me know what you think 😀

[sofietoft]

Looks great @eshanrnh !
I like the restructure into the Getting Started section. Makes sense 🙌