office: Add more vim-like mappings to neomutt

Added page up/down movement with the C-u/d/b/f key combinations, as well
as message and thread removal with dd (message), dT (thread) and dt
(sub-thread) chords.
Replies have been changed to rr (reply all) or ro (reply one).

The 'new' flag can be toggled by s (for seen) as previously, though now
other flags can be toggled with S and all messages can be marked as seen
with C-s.

Other things are mostly the same, though threads can be collapsed with
za (one) or zA (all) and moved between with gt/gT.

office/.config/neomutt/maps

@@ -5,11 +5,29 @@ bind index,pager g       noop # don't send group-replies with g
 bind index       gg      first-entry
 bind index       G       last-entry
 bind index       <space> collapse-thread
-bind index,pager \CF     next-page
-bind index,pager \CB     previous-page
-bind index,pager N       search-opposite # vim-like search
-bind index       s       toggle-new
-macro index \CS "T~U<enter><tag-prefix><clear-flag>N<untag-pattern>.<enter>" "mark all messages as read"
+
+# view manipulation
+bind  attach,browser,index,pager \CF next-page
+bind  attach,browser,index,pager \CB previous-page
+bind  attach,browser,index,pager \Cu half-up
+bind  attach,browser,index,pager \Cd half-down
+bind  browser,index,pager        \Ce next-line
+bind  browser,index,pager        \Cy previous-line
+
+bind  index                      s   toggle-new
+bind  index                      S   set-flag
+macro index                      \CS "T~U<enter><tag-prefix><clear-flag>N<untag-pattern>.<enter>" "mark all messages as read"
+bind  index,pager                w   display-toggle-weed
+
+# Thread manipulation
+bind pager d noop
+bind index,pager    dd delete-message
+bind index,pager    dT delete-thread
+bind index,pager    dt delete-subthread
+bind pager,index    gt next-thread
+bind pager,index    gT previous-thread
+bind pager,index    za collapse-thread
+bind pager,index    zA collapse-all
 
 # Email completion bindings
 bind editor <Tab> complete-query
@@ -33,7 +51,7 @@ bind index,pager <up>     sidebar-prev
 bind index,pager <right>  sidebar-open
 # search navigation
 macro index a "<limit>all\n" "show all messages (undo limit)"
-# notmuch search navigation
+bind browser,index,pager N search-opposite # vim-like search
 bind index \\ vfolder-from-query # notmuch search
 # pager navigation
 bind pager,attach h exit
@@ -48,7 +66,9 @@ bind compose p postpone-message
 macro compose M "F pandoc -s -f markdown -t html \ny^T^Utext/html; charset=UTF-8\n" "Convert from MD to HTML"
 
 # since we unbound the original g
-bind  index,pager R   group-reply
+bind  index,pager r   noop              # to avoid accidentally sending replies
+bind  index,pager rr  group-reply
+bind  index,pager ro  reply
 # open urls found in the e-mail
 macro index,pager \CU "|urlview<enter>" "call urlview to open links"