WIP

It's not immediately clear to me why I'd want to build a site like this. Will it help me get a job? Help me get clients? Etc
Because your target audience is so broad, your messaging is very generic and doesn't really resonate with anyone I expect. If you were to hone in one a specific target demographic, you could speak more towards their pain points and how your service helps them
For the demo I recommend making it easy to go back to the homepage (e.g. big banner on top)
After signing up I'm sent back to the homepage with a small, disappearing notification saying to check my email inbox. You'll likely lose a lot of users in this step. I recommend immediately signing in users and letting them start building out their site. You can limit certain spam-sensitive functionality to after the user has confirmed their email account.
Some website builders go even as far as not requiring an email address at all to start building out the site. And only ask for the email address later to "save your progress". This is called a "lazy signup" and could potentially increase conversion rates a lot (but potentially also support load as people are bound to lose their progress by forgetting to enter their email address)
I'd rewrite the email subject from "Confirmation instructions" to something more compelling like "Start building your site…"
I do really like the design of both the home page and the back-end

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