Update REAMDE for freeze execution option

Author: juliasilge

README.md

@@ -3,7 +3,7 @@
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 <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by-sa/4.0/88x31.png" height = 20 /></a>
 
-This is the repo for the Positron website at <https://positron.posit.co/>. 
+This is the repo for the Positron website at <https://positron.posit.co/>.
 
 This site is built with [Quarto](https://quarto.org/) and the [Posit product documentation theme](https://github.com/posit-dev/product-doc-theme), and these educational materials are released under a [Creative Commons Attribution-ShareAlike 4.0 International License](https://creativecommons.org/licenses/by-sa/4.0/). Positron™ and the Positron icon™ are trademarks of Posit Software, PBC. All rights reserved.
 
@@ -13,12 +13,12 @@ We currently use the issue tracker for [Positron](https://github.com/posit-dev/p
 
 ## Linting
 
-This project uses [Vale](https://vale.sh/docs/) for automated linting and compliance with the Posit style guide. 
+This project uses [Vale](https://vale.sh/docs/) for automated linting and compliance with the Posit style guide.
 
 - If you are a Posit employee, you can find the "Posit Documentation Style Guide" on Confluence.
 - If you are an external contributor, we as reviewers will take responsibility for compliance with the guidelines. Thank you for being willing to improve our docs!
 
-Vale runs [via GH action on PRs](https://github.com/posit-dev/positron-website/actions/workflows/lint.yml), but you can also run it locally before you submit a PR if you have [installed Vale](https://vale.sh/docs/vale-cli/installation/) locally. Run `vale .` from the root directory of this project to lint the `.qmd` files used to build to site.
+Vale runs [via GH action on PRs](https://github.com/posit-dev/positron-website/actions/workflows/lint.yml), but you can also run it locally before you submit a PR if you have [installed Vale](https://vale.sh/docs/vale-cli/installation/) locally. Run `vale .` from the root directory of this project to lint the `.qmd` files used to build the site.
 
 ## Local development
 
@@ -29,3 +29,7 @@ The configurations run `quarto preview` and then open the site in a new browser
 - **Preview Docs (Edge)**: Preview the site in Edge
 
 The site will re-render as you make changes to the `.qmd` files.
+
+## Managing execution and rendering
+
+Some `.qmd` files used for our site involve executable code, like the `.qmd` file that creates <https://positron.posit.co/download>. We currently use the ["Local Execution with CI Rendering" option described in the Quarto docs](https://quarto.org/docs/publishing/ci.html#rendering-for-ci), with the [freeze](https://quarto.org/docs/projects/code-execution.html#freeze) execution option to make it easier for us to collaborate together across the large number of pages. For now, if you need to update a page involving computations, be sure to render that page locally and check in the files created in the `_freeze` directory.