I see some mention of a Tailwind template for the landing page, but how did you do the secondary pages and the admin interface? The blog?
Also, I see some mention of Vue. Did you do the admin interface differently than the main site?
The other pages e.g. the blog, FAQ, posts etc. are just very simple layouts along with the nav bar and footer.
I'm using Jigsaw[1] which is a static site generator that allows you to use Laravel's blade templating engine, it's awesome.
The admin interface I made myself using a few Vue components, it is a reasonably simple layout to be honest.
Yes the account site where you login (everything at app.anonaddy.com) is completely separate from the landing page (anonaddy.com).
The first is a Laravel app, the second is a static site. They both have different repositories on GitHub. Feel free to browse through all the source code to get a better understanding of how it works. Just let me know if you have any more questions about it.
If you are looking for some help or inspiration with UI design I highly recommend the Refactoring UI book[2] by Adam Wathan and Steve Schoger.
[1] https://jigsaw.tighten.co/ [2] https://refactoringui.com/