* add alt-text field to image meta data files
* add aria-label to some HelloThere links
* improve flex-card procedure to render alt-text for images and aria-hide the new-badge because it causes problems
* revert HelloThere modified date
* Change favicon format from ICO to PNG
* Revert renaming `./favicon.ico`
Keep the backwards compatible file name `./favicon.ico` (though they will actually be in PNG format now).
* Add SVG template for creating favicons
Add `favicons.svg`, the template for creating the current PNG favicons, along with some helpful information about it in `favicons.svg.md`.
* Add source Inkscape SVG
Add source Inkscape SVG as an example of image tiddler in tw-com
