Add Aylin Theme (#1235)

This is a port of
[aylin](https://github.com/AhmedAbdulrahman/aylin-vscode-theme) as well
as a variant based off
[aylin.vim](https://github.com/AhmedAbdulrahman/aylin.vim).

### Preview:
<table>
  <tr>
<td rowspan="1"><img
src="https://github.com/bIaqat/aylin-theme-zed/raw/main/assets/aylin.png"
width="500"></td>
<td><img
src="https://github.com/bIaqat/aylin-theme-zed/raw/main/assets/aylin-selene.png"
width="500"></td>
  </tr>
</table>

.gitmodules

@@ -58,6 +58,10 @@
 	path = extensions/awk
 	url = https://github.com/dangh/zed-awk.git
 
+[submodule "extensions/aylin-theme"]
+	path = extensions/aylin-theme
+	url = https://github.com/biaqat/aylin-theme-zed.git
+
 [submodule "extensions/base16"]
 	path = extensions/base16
 	url = https://github.com/bswinnerton/base16-zed.git

extensions.toml

@@ -64,6 +64,10 @@ version = "0.1.0"
 submodule = "extensions/awk"
 version = "0.0.1"
 
+[aylin-theme]
+submodule = "extensions/aylin-theme"
+version = "0.5.0"
+
 [base16]
 submodule = "extensions/base16"
 version = "0.1.0"