nvim: Improve mini.pairs triple mappings

Whenever there is a left-over quote (') or double quote ("), if we want
to 'close' it, mini.pairs will by default add a new pair (e.g. """)
instead. This simply changes it to close the pair. Makes some
'double-quote' pairings harder (e.g. we have a python dict: {"name"})
and want to add another {"name""value"} into it, but this happens
relatively rarely in my use cases. The first on the other hand happens
frequently enough to be an annoyance.

Additionally, did the same for back-ticks so we can more easily create
triple backticks ``` which are essential in many literate programming
markup languages (markdown, quarto, rmd and so on).

nvim/.config/nvim/lua/plugins/base.lua

@@ -250,7 +250,33 @@ return {
 					require("mini.map").setup()
 					require("mini.move").setup()
 					require("mini.operators").setup()
-					require("mini.pairs").setup()
+					require("mini.pairs").setup({
+						mappings = {
+							-- these mappings ensure that when trying to _close_ any of the pairs
+							-- it will not double insert:
+							-- " <- you are here. Normal pairs will do """. This config will do "".
+							['"'] = {
+								action = "closeopen",
+								pair = '""',
+								neigh_pattern = '[^\\"].',
+								register = { cr = false },
+							},
+							["'"] = {
+								action = "closeopen",
+								pair = "''",
+								neigh_pattern = "[^%a\\'].",
+								register = { cr = false },
+							},
+							["`"] = {
+								action = "closeopen",
+								pair = "``",
+								neigh_pattern = "[^\\`].",
+								register = { cr = false },
+							},
+							["<"] = { action = "open", pair = "<>", neigh_pattern = "\r." },
+							[">"] = { action = "close", pair = "<>" },
+						},
+					})
 					require("mini.trailspace").setup()
 				end,
 			})