feat: support no custom domain/dns/certs

[hikeeba]

Proposed changes

Add support for websites that do not need or have a domain name yet.

Commentary

Anything else we should know when reviewing?

Types of Changes

What types of changes does your code introduce? Check all the boxes that apply

• Bugfix (non - breaking change which fixes an issue)
• New feature or Enhancement (non - breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Chore (documentation, refactoring, dependency upgrade, etc.)

Chores

Check all the boxes that apply

• This PR includes breaking changes which are documented in the description and associated commit messages (see the Contributing Guide for more information on how this should be done)
• This PR impacts documentation, and it has been updated (or an issue has been created and linked)
• This PR's changes are covered by the automated tests

[codecov]

Codecov Report

Patch coverage: 89.47% and project coverage change: +0.25 🎉

Comparison is base (5ad8f6f) 92.57% compared to head (c7929b4) 92.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   92.57%   92.83%   +0.25%     
==========================================
  Files          34       34              
  Lines         566      586      +20     
  Branches      138      154      +16     
==========================================
+ Hits          524      544      +20     
  Misses         42       42              

Impacted Files	Coverage Δ
src/single-page-app.ts	88.00% <83.33%> (+1.63%)	⬆️
src/website.ts	100.00% <100.00%> (ø)

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