* Ability to set header image for a Page
- Add header image to Page
- Show it on Page view
- Show correctly it on Page list view
- On the Page list view, pages have a light border
to make it easier to see an image belongs to a page
* Maybe it looks better
* Use <img> instead if <x-image>
* src -> :src; set width
* Update page.vue
Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
