fix: man_pages previewer, respecting MANPATH and apropos output parsing (#1764)

- introducing putils writer and use it rather than using PAGER env var
- introducing env for lua/telescope/_.lua job interface
  - to respect MANPATH (and PATH just in case)
- fix for apropos output parsing might return e.g. `alacritty, Alacritty`
  We need to split on first `,`

lua/telescope/make_entry.lua

@@ -611,6 +611,11 @@ function make_entry.gen_from_apropos(opts)
 
   return function(line)
     local keyword, cmd, section, desc = line:match "^((.-)%s*%(([^)]+)%).-)%s+%-%s+(.*)$"
+    -- apropos might return alternatives for the cmd which are split on `,` and breaks everything else
+    -- for example on void linux it will return `alacritty, Alacritty` which will later result in
+    -- `man 1 alacritty, Alacritty`. So we just take the first one.
+    -- doing this outside of regex because of obvious reasons
+    cmd = vim.split(cmd, ",")[1]
     return keyword
         and sections[section]
         and {