scanservjs: Deploy scanserv-js

*scanserv-js* is a web-based front-end for SANE.  It allows scanning
documents from a browser.

Using the `config.local.js` file, we implement the `afterScan` hook to
automatically upload scanned files to *paperless-ngx* using its REST
API.

scanservjs/README.md

@@ -0,0 +1,36 @@
+# scanserv-js
+
+[scanservjs][0] is an open source, web-based front-end for the [SANE][1]
+software suite.  It provides a simple graphical user interface for scanning
+photos and documents using any local or network-connected SANE-compatible
+scanner.
+
+## Installation
+
+```sh
+kubectl apply -k scanservjs
+```
+
+Environment variables used by the [container image][2] can be set in the
+`scanservjs.env` file.
+
+
+## Integration with *paperless-ngx*
+
+[paperless-ngx][3] is an open-source, web-based document management platform.
+Integrating *scanservjs* with *paperless-ngx* allows scanned documents to be
+fed automatically into the document management system for OCR, analysis, and
+classification.  This integration is performed using the `afterScan` hook in
+the *scanservjs* `config.local.js` file and the *paperless-ngx* REST API to
+upload documents scanned as PDF files.
+
+To enable the integration, specify the URL to the *paperless-ngx* service in
+the `PAPERLESS_URL` environment variable.  Additionally, create an
+[authentication token][4] for *paperless-ngx* user, store it in a file, and set
+the `PAPERLESS_TOKEN_FILE` environment variable to the file path.
+
+[0]: https://github.com/sbs20/scanservjs
+[1]: http://sane-project.org/
+[2]: https://github.com/sbs20/scanservjs/blob/master/docs/docker.md
+[3]: https://docs.paperless-ngx.com/
+[4]: https://docs.paperless-ngx.com/api/#authorization