Add docs on each field and setting for creating an email

[RCheesley]

Currently our docs are somewhat lacking in explaining the email creation/editing process - we don't have an overview explaining what each field does, for example. The Channels>Emails page could do with an overhaul to improve this!

[RCheesley]

mautic/mautic#13081 should also be featured here.

[vibhuti019]

I would like to take this issue

[favour-chibueze]

I would like to take this issue

Alright, thank you

[adiati98]

Hi @vibhuti019,

As this issue hasn't been worked on for a while, we'll unassign you from it.
Feel free to let us know if you'd like to continue work on this, and we'll assign it back to you.