Take out prettier-standard

[timbl]

Suggest removing use of prettier-standard and just using eslint to check

• prettier-standard has a bug which makes break eslint and then complain about it
• prettier-standrad unlike prettier is dangerous in that without any write or fix parameter it will overwrite you files.
• prettier-standard complains about say a let which should be const but won't fix it
• There are command line problems if you try to just check one file it seems to process them all
• It checks HTML but doesn't have an option for polyglot which we should be using ideally

Any format checker we use must have the --fix option to fix things automatically, so prettier-standard can't do that with let > const it seems

[megoth]

This was done in the corresponding PRs:

• Removing prettier, reverting to just use eslint mashlib#81
• Removing prettier, reverting to just use eslint solid-panes#200
• https://github.com/solid/solid-ui/pull/161
• Removing prettier, reverting to just use eslint chat-pane#23
• Removing prettier, reverting to just use eslint folder-pane#8
• Removing prettier, reverting to just use eslint source-pane#4
• Removing prettier, reverting to just use eslint contacts-pane#11
• Removing prettier, reverting to just use eslint issue-pane#11
• Removing prettier, reverting to just use eslint meeting-pane#4
• Removing prettier, reverting to just use eslint pane-registry#3