* chore: point residual repo refs at dmtrKovalenko/fff
Update install URLs, download targets, and docs after the GitHub
rename from fff.nvim to fff. Preserve the existing Neovim package
name (fff.nvim) in lazy/vim.pack snippets so upgraders keep the same
install dir and lockfile identity.
* chore(docs): align Neovim package name with repo basename
Drop the explicit fff.nvim package name so lazy/vim.pack use fff from
the repository URL. Mild migration cost for existing installs (new
plugin dir + clean of the old one). Drop this commit to keep the
lowest-pain name=fff.nvim install snippets from the previous commit.
Joe Taber