[neovim] replace neo-tree with snacks.nvim

Replace neo-tree.nvim with snacks.nvim for file explorer functionality and
remove several other plugins including:
- mini-animate
- mini-starter
- indent-blankline

The snacks.nvim plugin provides better file explorer, dashboard, indentation
guides, and other UI improvements in a more cohesive package.

Also removed the large file autocommand as snacks.nvim handles this with its
bigfile module.

.config/nvim/lua/plugins/lsp/init.lua

@@ -6,21 +6,15 @@ require("plugins.lsp.lsp-saga")
 local win = require("lspconfig.ui.windows")
 win.default_options.border = "rounded"
 
-local signs = {
-	{ name = "DiagnosticSignError", text = "" },
-	{ name = "DiagnosticSignWarn", text = "" },
-	{ name = "DiagnosticSignHint", text = "" },
-	{ name = "DiagnosticSignInfo", text = "" },
-}
-
-for _, sign in ipairs(signs) do
-	vim.fn.sign_define(sign.name, { texthl = sign.name, text = sign.text, numhl = "" })
-end
-
 local config = {
 	virtual_text = false,
 	signs = {
-		active = signs,
+		text = {
+			[vim.diagnostic.severity.ERROR] = "",
+			[vim.diagnostic.severity.WARN] = "",
+			[vim.diagnostic.severity.INFO] = "",
+			[vim.diagnostic.severity.HINT] = "",
+		},
 	},
 	update_in_insert = true,
 	underline = true,
@@ -34,15 +28,4 @@ local config = {
 		prefix = "",
 	},
 }
-
-vim.diagnostic.config(config)
-
-vim.lsp.handlers["textDocument/hover"] = vim.lsp.with(vim.lsp.handlers.hover, {
-	border = "rounded",
-})
-
-vim.lsp.handlers["textDocument/signatureHelp"] = vim.lsp.with(vim.lsp.handlers.signature_help, {
-	border = "rounded",
-})
-
 vim.diagnostic.config(config)