update themes.json and fix inconsistent eCash key (all using eCash now)
we should make a theme tool that extracts all archives into their own subdirectories, manages updating version numbers, displays the list of coins, the themes, and their images, and allows you to drag-and-drop files (if necessary ... or why not just automate that?) to ship new coin updates to all the theme servers
update: no we shouldn't, but there are some scripts available on the scripts branch for next time.
updated theme zips and their hashes in theme.json except for chan and dark chan themes
chan.zip and dark_chan.zip updates omitted because of filesize limitations:
```
~/src/stack-theme-selector-server/data/themes$ git push
Enumerating objects: 29, done.
Counting objects: 100% (29/29), done.
Delta compression using up to 16 threads
Compressing objects: 100% (15/15), done.
Writing objects: 100% (15/15), 19.87 MiB | 1.03 MiB/s, done.
Total 15 (delta 11), reused 0 (delta 0)
remote: Resolving deltas: 100% (11/11), completed with 7 local objects.
remote: error: Trace: e1b22f30bb4537608d11904078c85aa7590f679e080f0a2ab566be57badd5837
remote: error: See https://gh.io/lfs for more information.
remote: error: File data/themes/dark_chan.zip is 108.89 MB; this exceeds GitHub's file size limit of 100.00 MB
remote: error: File data/themes/chan.zip is 109.07 MB; this exceeds GitHub's file size limit of 100.00 MB
remote: error: GH001: Large files detected. You may want to try Git Large File Storage - https://git-lfs.github.com.To github.com:cypherstack/stack-theme-selector-server
! [remote rejected] temp -> temp (pre-receive hook declined)
```
added images to each theme and their `theme.json`s
and ignored non-zip files in working theme data dir for QoL
