[nvim] feat: add env snippet

!!!BREAKING : remove "rmk" snippet

.config/nvim/lua/plugin/luasnip.lua

@@ -450,12 +450,14 @@ ls.snippets = {
                         f(copy, 1),
                         t({ "}", "" }),
                 }),
-                s("rmk", {
+                s("env", {
-                        t({ "\\begin{rmk}" }),
+                        t({ "\\begin{" }),
-                        t({ "", "\t" }),
+                        i(1, "foo"),
-                        i(1),
+                        t({ "}", "\t" }),
+                        i(2),
                         t({ "", "\\end{" }),
-                        i(0),
+                        f(copy,1),
+                        t({ "}", "" }),
                 }),
 
 	},