Add basic bootstrap JS and CSS files to repo

Bootstrap is a great tool to use, however unnecessary dependencies are to be avoided. However, as bootstrap allows users to download their source files, it's possible to download the js and css files and include them in the repo, rather than simply linking to them.

Download the bootstrap API and place them under the "Shared" folder.

Start by inspecting the existing Shared folder and how frontend assets are organized. Add the Bootstrap JavaScript and CSS source files there, then verify the repository contains the local assets rather than relying on externally linked files.

Written by the indexing model from the issue text.