fix: remove debug print

doc: update readme.

fixes #22
fixes #12

fix: make kind field nullable

fix(window): don't raise error for unknown relative value

fix: always check lsp in priorities

feat: allow priority per lsp

fix: save original vim.ui.select method always on setup

feat: add fallback_threshold configuration

feat: assign filetype and buftype for fastaction popup

fix(priority): default to empty array