Cleaned up the media folder and added a banner generator (#1027)

media/Banner/README.md

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+# Banner
+
+`generate_banner.py` creates `app/MindWork AI Studio/wwwroot/svg/banner.svg`, the banner on the start page of the app and at the top of the repository's README.
+
+The app shows the banner through an `<img>` element, where neither the app's CSS nor its web fonts apply. Therefore, the script converts every text into outlines, so the banner looks the same on Windows, macOS, Linux, and GitHub. The text uses [Inter](https://github.com/rsms/inter) (SIL Open Font License 1.1). The icons are the Material Icons the app itself uses, read from the MudBlazor package of the app (Apache License 2.0).
+
+## Setup
+
+You need Python 3 and a build of the app, so NuGet has restored MudBlazor into its package cache. The script reads the MudBlazor version and the target framework from the app's project file.
+
+In this folder, create a virtual environment and install the packages:
+
+```bash
+python3 -m venv .venv
+.venv/bin/pip install -r requirements.txt
+```
+
+Then download the font. The script expects this exact version of Inter and warns about any other one, because a different version changes the outlines:
+
+```bash
+curl -L -o Inter.ttf "https://raw.githubusercontent.com/google/fonts/e1d6480102fed30739fead0faee463101f892c8f/ofl/inter/Inter%5Bopsz,wght%5D.ttf"
+```
+
+Neither the font nor the virtual environment belongs in the repository; `.gitignore` keeps both out.
+
+On Windows, use `.venv\Scripts\pip` and `.venv\Scripts\python` instead.
+
+## Usage
+
+```bash
+.venv/bin/python generate_banner.py
+```
+
+The script overwrites the banner in the app. To write it somewhere else, for example to compare two versions, pass `--output <file>`. Without any change to the script, the output is identical to the committed banner.
+
+On macOS, `qlmanage -t -s 1920 -o <folder> <file>` renders a preview with WebKit, the engine of the app on macOS. Any browser shows the file as well.
+
+## Changing the banner
+
+The content sits at the top of the script:
+
+- `EYEBROW`, `NAME`, and `TAGLINE` form the wordmark on the left.
+- `CHIPS` lists the eight capabilities on the right: two rows of four, where the chips of one column share their width. Pair labels of similar length in a column. The icon is the name of an icon in `Icons.Material.Filled`, ideally the one the app uses for that feature.
+- `LAYOUT` holds positions and sizes, `CREAM` the color of text and icons.
+
+Keep the labels in US English and short. Check the result in a narrow window as well: at 700 pixels, the labels are only about 10 pixels high. On wide windows, the start page crops up to 32 units at the top and the bottom, so text and chips must stay between y = 48 and y = 272.