chore(home-manager): put neovim plugins configuration in a separate directory

modules/home-manager/cli/neovim/files/plugins/treesitter_context.lua

@@ -0,0 +1,12 @@
+require('treesitter-context').setup{
+    enable = true,
+    max_lines = 7,
+    min_window_height = 0,
+    line_numbers = true,
+    multiline_threshold = 4,
+    trim_scope = 'outer',
+    mode = 'cursor',
+    separator = nil,
+    zindex = 20,
+    on_attach = nil,
+}