Have website hint search engines to use the icons and screenshots

[probonopd]

https://github.com/jekyll/jekyll-seo-tag/blob/master/docs/usage.md

The SEO tag will respect the following YAML front matter if included in a post, page, or document:

• title - The title of the post, page, or document
• description - A short description of the page's content
• image - URL to an image associated with the post, page, or document (e.g., /assets/page-pic.jpg)
• author - Page-, post-, or document-specific author information (see Advanced usage)
• lang - Page-, post-, or document-specific language information

We should make sure that we are using those tags, especially the first three. This will hopefully get the applications displayed nicely in search engines.

[probonopd]

For Twitter: https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/summary-card-with-large-image.html

Check with
https://cards-dev.twitter.com/validator

[probonopd]

We can do better than this for the start page: