[Keymap] Add Git keymap for ANAVI Macro Pad 8 (#12436)

Git keymap for ANAVI Macro Pad 8 with the following shortcuts.
On the first row from left to right:

- git status
- git log
- git pull
- git push

On the second row from left to right:

- git diff
- git add
- git commit
- FN key to switch to the 2nd layout and control lights

Reduce the number of supported RGB animations and effects in
config.h to shrink the firmware size and fit it on the device.

Signed-off-by: Leon Anavi <leon@anavi.org>

keyboards/anavi/macropad8/keymaps/git/config.h

@@ -0,0 +1,23 @@
+/* Copyright 2021 Leon Anavi <leon@anavi.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#undef RGBLIGHT_ANIMATIONS
+#define RGBLIGHT_EFFECT_BREATHING
+#define RGBLIGHT_EFFECT_CHRISTMAS
+#define RGBLIGHT_EFFECT_RAINBOW_MOOD
+#define RGBLIGHT_EFFECT_SNAKE