Switch from fontawesome to bootstrap icons

[cthoyt]

Remove this

bioregistry/src/bioregistry/app/templates/base.html

Line 30 in 772b11a

<script src="https://kit.fontawesome.com/4c86883252.js" crossorigin="anonymous"></script>

And anywhere there is something like with class="fa fa-, like this

bioregistry/src/bioregistry/app/templates/base.html

Line 74 in 772b11a

Summary <i class="fa fa-external-link" aria-hidden="true"></i>

we can switch to using bootstrap's built-in icons (https://icons.getbootstrap.com). In this instance, switch it to <i class="bi bi-box-arrow-up-right"></i>.

You can find all instances with:

git clone https://github.com/biopragmatics/bioregistry.git
cd bioregistry/src/bioregistry/app
grep -Irn "fa-"
```.


Test it by installing the bioregistry with


```shell
git clone https://github.com/biopragmatics/bioregistry.git
cd bioregistry
uv pip install -e .[web]
bioregistry web

And navigating around to see the new icons are there