Move all Regeneration processes into single unlinked page

[dyreschlock]

There is a lot of extra stuff going on in the background now in order to prepare the website for generation.

• We're making cover images
• We're generating HTML from post body text
• We're generating Image objects to put into the database
• We're looking up Google IDs and Direct Links for those Images
• We're generating thumbnails for posts, too.

Now with Issue #65, we're converting images again into WebP format, which will add the following processes.

• Create WebP files for all photos in a directory
• Look up the Google IDs and Direct Links for those Images.

Because we're doing so much extra stuff, all of these processes should be consolidated into a single page. From this page, we can click on what we want to do rather than have to find everything in the background.

[dyreschlock]

I think this is good for now. Open a new case if you want to add a Text Field for the Thumbnail generation