move vendored files into their own folder

core/static/vendored/zipjs/LICENSE

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+BSD 3-Clause License
+
+Copyright (c) 2023, Gildas Lormeau
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

core/static/vendored/zipjs/README.md

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+# Built scripts of zip.js
+
+**Warning**: These files are not compatible with ES modules, i.e. they cannot be imported with `import`. Instead, import `index.js` in the root folder of the project or one of the files prefixed with `zip-` in the [`/lib`](../lib) folder (e.g. `/lib/zip-no-worker-inflate.js`).
+
+- for production (minified):
+
+|                                | [`ZipReader`](https://gildas-lormeau.github.io/zip.js/api/classes/ZipReader.html) API | [`ZipWriter`](https://gildas-lormeau.github.io/zip.js/api/classes/ZipWriter.html) API | [`zip.fs`](https://gildas-lormeau.github.io/zip.js/api/classes/FS.html) API | Web Workers | No Web Workers | Usage                                                 |
+|--------------------------------|-----------------|-----------------|--------------|-------------|----------------|-------------------------------------------------------|
+| `zip.min.js`                   |               x |               x |              |           x |                | compression/decompression with web workers            |
+| `zip-no-worker.min.js`         |               x |               x |              |             |              x | compression/decompression without web workers         |
+| `zip-no-worker-inflate.min.js` |               x |                 |              |             |              x | decompression without web workers                     |
+| `zip-no-worker-deflate.min.js` |                 |               x |              |             |              x | compression without web workers                       |
+| `zip-full.min.js`              |               x |               x |              |           x |              x | compression/decompression with or without web workers |
+| `zip-fs.min.js`                |               x |               x |            x |           x |                | compression/decompression with web workers            |
+| `zip-fs-full.min.js`           |               x |               x |            x |           x |              x | compression/decompression with or without web workers |
+
+- for development/debugging:
+
+|                       | `zip` API | [`zip.fs`](https://gildas-lormeau.github.io/zip.js/api/classes/FS.html) API | Web Workers | No Web Workers | 
+|-----------------------|-----------|--------------|-------------|----------------|
+| `zip.js`              |         x |              |           x |                |
+| `zip-full.js`         |         x |              |           x |              x |
+| `zip-fs.js`           |         x |            x |           x |                |
+| `zip-fs-full.js`      |         x |            x |           x |              x |
+
+- `z-worker.js` can be used as a web worker script if the [Content Security Policy](https://developer.mozilla.org/docs/Web/HTTP/CSP) blocks scripts loaded with a `blob:` scheme
+- `z-worker-fflate.js` is the web worker script for using [fflate](https://gildas-lormeau.github.io/zip.js/core-api.html#alternative-codec-fflate)
+- `z-worker-pako.js` is the web worker script for using [pako](https://gildas-lormeau.github.io/zip.js/core-api.html#alternative-codec-pako)