What's the infrastructure for your web app? Static HTML/CSS, custom PHP with or without a framework (if you are using a framework, which one?), custom Perl, or a CMS (and if so, which one)? Do your existing 150 pages use CSS style sheets that need to be converted to Bootstrap?
The existing app uses templated HTML from a Perl web back end. The back end is servicing an existing bootstrap template (customised) but we're looking to move to another bootstrap based template called Nifty.
The Perl backend is a custom built framework with full in house support should you need any assistance.
Training on how the backend delivers the templates will be provided and on-going support if you need it.