Neovim v0.7 Migration

[axieax]

• [x] remove urlview.vim - user command + completion using Lua API instead (also vim.tbl_filter)
• [x] vim.keymap.set by default (can pass function reference as RHS)
• [x] urlview.autoload function calls urlview.config._reset_defaults() and registers user command
• [x] remove unnecessary Telescope extension file
• [x] debug key to vim.log.levels?
• [x] tag v0.6 compat version
• [x] update README to clearly mention breaking changes to issues thread
• [x] remove v0.6 from workflow matrix
• [x] !docs + separate custom search contexts from setup

Optional:

• add note about plugin lazy loading to README (not necessary - by design)