Change e-mail, and add .mailmap

Mapped my old e-mail to the new one.
git shortlog -sne also showed commits from <quinnthepigeon@gmail.com>,
which is no-longer a valid e-mail. This has also been mapped.

.gitconfig

@@ -1,6 +1,6 @@
 [user]
 	name = Quinn
-	email = quinnthepigeon@proton.me
+	email = quinn@thepigeongenerator.xyz
 	signingkey = 47378BDBE5E29830
 [tag]
 	gpgSign = true

.mailmap

@@ -0,0 +1,2 @@
+Quinn <quinn@thepigeongenerator.xyz> <quinnthepigeon@gmail.com>
+Quinn <quinn@thepigeongenerator.xyz> <quinnthepigeon@proton.me>

.stow-local-ignore

@@ -1,4 +1,5 @@
 \.git
 \.gitmodules
+\.mailmap
 LICENSE
 README\.md