Update cards with missing images

[LDannijs]

Right now there are a few cards that you can select from that do not have an image. This is not a huge issue, but i find myself glossing over them quickly or not knowing what they do at a glance. Seeing as most cards do have a visual representation i'd like to see the ones missing to get one as well, would just be some nice UX.

Cards that do not have an image include:

• Alarm Panel
• Statistics Graph
• Statistics
• Humidifier
• Plant Status
• Thermostat
• Conditional
• Entity Filter
• Grid
• Horizontal Stack
• Webpage
• Logbook
• Vertical Stack
• To-do List