docs: cleanup old todo list (#483)

TODO.md

@@ -1,55 +0,0 @@
-# bugs
-
-- [x] index out of bounds when resizing the terminal to a very small size
-- [x] meta previews in cache are not terminal size aware
-
-# tasks
-
-- [x] preview navigation
-- [ ] add a way to open the selected file in the default editor (or maybe that
-  should be achieved using pipes?) --> xargs
-- [x] maybe filter out image types etc. for now
-- [x] return selected entry on exit
-- [x] piping output to another command
-- [x] piping custom entries from stdin (e.g. `ls | tv`, what bout choosing
-  previewers in that case? Some AUTO mode?)
-- [x] documentation
-
-## improvements
-
-- [x] async finder initialization
-- [x] async finder search
-- [x] use nucleo for env
-- [x] better keymaps
-- [ ] mutualize placeholder previews in cache (really not a priority)
-- [x] better abstractions for channels / separation / isolation so that others
-  can contribute new ones easily
-- [x] channel selection in the UI (separate menu or top panel or something)
-- [x] only render highlighted lines that are visible
-- [x] only ever read a portion of the file for the temp preview
-- [x] profile using dyn Traits instead of an enum for channels (might degrade performance by storing on the heap)
-- [x] I feel like the finder abstraction is a superfluous layer, maybe just use
-  the channel directly?
-- [x] support for images is implemented but do we really want that in the core?
-  it's quite heavy
-- [x] shrink entry names that are too long (from the middle)
-- [ ] more syntaxes for the previewer https://www.sublimetext.com/docs/syntax.html#include-syntax
-- [ ] more preview colorschemes
-
-## feature ideas
-
-- [x] environment variables
-- [x] aliases
-- [ ] shell history
-- [x] text
-- [ ] text in documents (pdfs, archives, ...) (rga, adapters)
-  https://github.com/jrmuizel/pdf-extract
-- [x] fd
-- [ ] recent directories
-- [ ] git (commits, branches, status, diff, ...)
-- [ ] makefile commands
-- [ ] remote files (s3, ...)
-- [ ] custom actions as part of a channel (mappable)
-- [x] add a way of copying the selected entry name/value to the clipboard
-- [ ] have a keybinding to send all current entries to stdout
-- [x] git repositories channel (crawl the filesystem for git repos)