Reorganise "Email" part of guide -draft issue -not complete about civicrm-user-guide

[seancolsen]

I like this! To build on your plan, I'll offer some additional suggestions.

• Change the page title "Email" to "Small emails" to make it more specific
• Change the page title "Overview" to "Email". This way the reader will see "Email", click to expand, and see "Email" again right below it. Yes, in a way, that's kind of weird and redundant. But overall, I think it's actually a good way to organize content, especially because it allows us to use an index.md file for the page which simplifies the URL. Here's an example of this strategy in action: https://docs.civicrm.org/sysadmin/en/latest/upgrade/ Further, MkDocs has a bit of a limitation in that menu entries must be the same as page titles. Thus, to make the pages google-friendly, we kind of need to use more descriptive menu entries. For example, right now we have a lot of pages titled "What You Need To Know". These pages are harder for people to find on Google, and also harder for people to distinguish between if they have multiple tabs open in their browser.

Side note:

• I agree that the word "part" is awkward, as you mention. I made this PR to fix it.

[github-actions]

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