add MacAir 7,2 swayfx config, changed swaybar to work well with this mac low resolution, added swayidle directly into sway's config

configs/sway_g/MacAir7,2/README.md

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+# Sway config for Macbook Air 7,2 (2017)
+**Specs:**
+- 8GB RAM
+- Intel Quad Core i5-5350U
+- Instel HD Graphics 6000
+- 256 GB SSD
+
+# Dependencies
+**Arch**
+```bash
+sudo pacman -S swaybg swayidle swaylock mako
+
+# yay needed to install the following
+
+yay swayfx # Pick the first option
+yay tofi # Pick the first option
+```