chore: move plugins, so they are easier to find (#430)

Drew Smirnoff created

Change summary

plugins/account_indicator.lua   | 0 
plugins/attachment_reminder.lua | 0 
plugins/char_counter.lua        | 0 
plugins/domain_filter.lua       | 0 
plugins/email_age.lua           | 0 
plugins/empty_body_guard.lua    | 0 
plugins/folder_announcer.lua    | 0 
plugins/folder_favorites.lua    | 0 
plugins/greeting.lua            | 0 
plugins/hello.lua               | 0 
plugins/inbox_activity.lua      | 0 
plugins/keyword_highlighter.lua | 0 
plugins/notify_github.lua       | 0 
plugins/read_tracker.lua        | 0 
plugins/reading_time.lua        | 0 
plugins/recipient_counter.lua   | 0 
plugins/reply_all_warn.lua      | 0 
plugins/self_email_warn.lua     | 0 
plugins/send_logger.lua         | 0 
plugins/sender_frequency.lua    | 0 
plugins/session_stats.lua       | 0 
plugins/spam_detector.lua       | 0 
plugins/subject_length_warn.lua | 0 
plugins/subject_reminder.lua    | 0 
plugins/thread_tracker.lua      | 0 
plugins/unread_counter.lua      | 0 
plugins/vip_alerts.lua          | 0 
plugins/word_counter.lua        | 0 
28 files changed

Detailed changes