Adding upstream version 1.9.1+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

README.md

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+<p align="center">
+  <a href="https://v5.getbootstrap.com/">
+    <img src="https://v5.getbootstrap.com/docs/5.0/assets/brand/bootstrap-logo-shadow.png" alt="Bootstrap logo" width="200" height="165">
+  </a>
+</p>
+
+<h3 align="center">Bootstrap Icons</h3>
+
+<p align="center">
+  Official open source SVG icon library for Bootstrap with over 1,800 icons.
+  <br>
+  <a href="https://icons.getbootstrap.com/"><strong>Explore Bootstrap Icons »</strong></a>
+  <br>
+  <br>
+  <a href="https://getbootstrap.com/">Bootstrap</a>
+  ·
+  <a href="https://themes.getbootstrap.com/">Themes</a>
+  ·
+  <a href="https://blog.getbootstrap.com/">Blog</a>
+  <br>
+</p>
+
+[![Bootstrap Icons preview](https://github.com/twbs/icons/blob/main/.github/preview.png)](https://icons.getbootstrap.com)
+
+## Install
+
+Bootstrap Icons are packaged up and published to npm. We only include the processed SVGs in this package—it's up to you and your team to implement. [Read our docs](https://icons.getbootstrap.com/) for usage instructions.
+
+```shell
+npm i bootstrap-icons
+```
+
+For those [using Packagist](https://packagist.org/packages/twbs/bootstrap-icons), you can also install Bootstrap Icons via Composer:
+
+```shell
+composer require twbs/bootstrap-icons
+```
+
+[Also available in Figma.](https://www.figma.com/community/file/1042482994486402696/Bootstrap-Icons)
+
+## Usage
+
+Depending on your setup, you can include Bootstrap Icons in a handful of ways.
+
+- Copy-paste SVGs as embedded HTML
+- Reference via `<img>` element
+- Use the SVG sprite
+- Include via CSS
+
+[See the docs for more information.](https://icons.getbootstrap.com/#usage)
+
+## Development
+
+[![Build Status](https://github.com/twbs/icons/workflows/Tests/badge.svg)](https://github.com/twbs/icons/actions?workflow=Tests)
+
+Clone the repo, install dependencies, and start the Hugo server locally.
+
+```shell
+git clone https://github.com/twbs/icons/
+cd icons
+npm i
+npm start
+```
+
+Then open `http://localhost:4000` in your browser.
+
+### npm scripts
+
+Here are some key scripts you'll use during development. Be sure to look to our `package.json` for a complete list of scripts.
+
+| Script | Description |
+| --- | --- |
+| `start` | Alias for running `docs-serve` |
+| `docs-serve` | Starts a local Hugo server |
+| `pages` | Generates permalink pages for each icon with template Markdown |
+| `icons` | Processes and optimizes SVGs in `icons` directory |
+
+## Adding SVGs
+
+Icons are typically only added by @mdo, but exceptions can be made. New glyphs are designed in Figma first on a 16x16px grid, then exported as flattened SVGs with `fill` (no stroke). Once a new SVG icon has been added to the `icons` directory, we use an npm script to:
+
+1. Optimize our SVGs with SVGO.
+2. Modify the SVGs source HTML, removing all attributes before setting new attributes and values in our preferred order.
+
+Use `npm run icons` to run the script, run `npm run pages` to build permalink pages, complete those pages, and, finally, commit the results in a new branch for updating.
+
+## Publishing
+
+Documentation is published automatically when a new Git tag is published. See our [GitHub Actions](https://github.com/twbs/icons/tree/main/.github/workflows) and [`package.json`](https://github.com/twbs/icons/blob/main/package.json) for more information.
+
+## License
+
+MIT
+
+## Author
+
+[@mdo](https://github.com/mdo)