* feat(bufferline.lua): add configuration for bufferline plugin with options for indicator, diagnostics, offsets, separator_style, and always_show_bufferline
* feat(keymaps.lua): add keymaps for buffer navigation, terminal, and nvimtree * feat(nvim-tree.lua): add nvim-tree plugin with setup function
Closes #175 Closes #177 Closes #173 Closes #169 Closes #161 Closes #144 Closes #138 Fixes #136 Closes #137 Closes #131 Closes #117 Closes #130 Closes #115 Closes #86 Closes #105 Closes #70 Fixes #176 Fixes #174 Fixes #160 Fixes #158