Our great sponsors
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pages-gem
A simple Ruby Gem to bootstrap dependencies for setting up and maintaining a local Jekyll environment in sync with GitHub Pages
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If you mean a web app (a web page that anyone can access with an internet connection, but only with an internet connection), just get yourself some web-hosting and upload your files to it. This can be anything from buying a full domain and a web-hosting package all the way down to using the free tier of a systems like Github Pages or Heroku, depending on what you need (database/data storage, uptime guarantees, expected traffic levels, etc).
If you want it to be installable as a "native" mobile app, look at Apache Cordova, which - like Electron, but for mobile - takes your web app, wraps it in a native Android or iOS wrapper, exposes a bunch of additional APIs to Javascript to allow you to interact with phone hardware features, and allows you to compile your app as a "native" Android or iOS app that can be sideloaded or distributed through the platform's app-store.