Add cover images for posts

src/content/about/about.md

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+## About
+
+aurora is a minimal blog theme built with Astro, Svelte and plain CSS. It is focused on accessibility and usability.
+
+All the interactiveness of the website is packed into three dropdowns that are located at the right of the top navigation bar. Every menu can be opened with a simple keyboard shortcut:
+
+- Table of contents: **Shift + c**
+- Search for an article: **Shift + s**
+- Theme toggle: **Shift + t**
+- Close menu: Escape (**Esc**)
+
+The styles are simple, there are small improvements for some elements to keep everything consistent and responsive.
+
+### Table of contents
+
+Secondary headings (`<h2>`) are listed here, so each page is easy to navigate.
+
+### Search
+
+I wrote a simple algorithm for the search, and the matching works well. You can write the blog title words in any order, leave letters out, have multiple spaces between words, and more.
+
+### Theme toggle
+
+There are three websites themes: Light, Dark and System (inherits the theme of your browser or operating system).
+
+## Blog