fix: docs build (#1203)

packages/docs/docs/usage/secure-spreadsheets.md

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+---
+id: 'secure-spreadsheets'
+title: Secure Spreadsheets Editor
+sidebar_label: Secure Spreadsheets
+description: How to use the Standard Notes secure spreadsheets editor.
+keywords:
+  - standard notes
+  - docs
+  - notes app
+  - end-to-end encryption
+  - Template
+image: /img/logo.png
+hide_title: false
+hide_table_of_contents: false
+---
+
+## Introduction
+
+Secure Spreadsheets is a [derived editor](https://standardnotes.com/help/77/what-are-editors). It is derived from [Kendo UI Professional](https://github.com/telerik/kendo-ui-core#features-of-kendo-ui-core).
+
+A demo of the Secure Spreadsheets editor is available at [standardnotes.org/demo](https://standardnotes.com/demo). To use Secure Spreadsheets with Standard Notes, please sign up for [Standard Notes Extended](https://standardnotes.com/extensions) and install it by following the instructions described [here](https://standardnotes.com/help/29/how-do-i-install-extensions-once-i-ve-signed-up-for-extended).
+
+## Export
+
+You can export your spreadsheet as an `.xlsx` to use with Libre Office, Microsoft Office, Google Sheets, or other compatible program by clicking the download icon in the top left of the spreadsheets.
+
+You can also export your spreadsheet as a `.pdf` file. The download menu has the following options:
+
+- Export: Entire Workbook, Active Sheet, or Selection.
+- Paper size: A2, A3, A4, A5, B3, B4, B5, Folio, Legal, Letter, Tabloid, and Executive.
+- Margins: Normal and Wide.
+- Orientation: Portrait or Landscape.
+- With or without Guidelines (grid lines).
+- Center: Horizontally, Vertically, Neither, or Both.
+
+## License
+
+The Secure Spreadsheets editor is derived from [Kendo UI Professional](https://github.com/telerik/kendo-ui-core#features-of-kendo-ui-core), which is not released as free and open-source software. To prevent vendor lock-in, you can easily [export your spreadsheet](#export) as an `.xlsx` or `.pdf` file.