revert CONTRIBUTING as changes present in #550

Author: alex-courtis

CONTRIBUTING.md

@@ -2,17 +2,10 @@
 
 Thank you for your contribution!
 
-## Quick: Add/Change An Icon
-
-1. Copy or modify a line in `icons-default.lua` and set:
-   - `icon`
-   - `color` (dark)
-   - `name`
-1. Run `make` to:
-   - generate `cterm_color`
-   - format/order/normalise `icons-default.lua`
-   - generate `icons-light.lua`
-1. Commit both `icons-default.lua` and `icons-default.lua`
+## Order
+
+Please ensure `icons_by_filename`, `icons_by_file_extension`, `icons_by_operating_system`, `icons_by_desktop_environment`,
+`icons_by_window_manager` and `filetypes` are ordered alphabetically, to prevent merge conflicts.
 
 ## Prerequisites
 
@@ -73,27 +66,24 @@ Add the icon to table **3.**, **4.**, **5.** if the icon is from an OS, DE or WM
 Each icon must have the following structure (this is an example):
 
 ```lua
-  ["lua"]           = { icon = "", color = "#51A0CF", cterm_color = "74",  name = "Lua"                        },
+[".gitconfig"] = {
+    icon = "",
+    color = "#41535b",
+    cterm_color = "0",
+    name = "GitConfig",
+},
 ```
 
-> [!IMPORTANT]
-> If the icon you need is not available on Nerd Fonts you first need to make a
-> PR to a project that feeds glyphs to Nerd Fonts. Probably the most adequate
-> project to contribute is <https://github.com/devicons/devicon>.
-> Take into account that **months** can pass before the icon is available on the
-> Nerd Fonts project, once there feel free to open a PR on this project.
-
 ***Key/value pairs must appear in the same exact order!***
 
 - `color` must contain a color in the html notation
-- `cterm_color` must contain a number (any number)
+- `cterm_color` must be below `color`, and it must contain a number (any number)
 - the correct value for `cterm_color` will be generated by the script
 - `name` must only contain alphanumeric characters (don't use `/`, `-`, `_`)
 
 Ensure your current working directory is the repo root. Run `make`. This will:
 
 - Update `cterm_color` based on `color`
-- Format/order/normalise `lua/nvim-web-devicons/icons-default.lua`
 - Generate `lua/nvim-web-devicons/icons-light.lua`
 
 Please commit both `lua/nvim-web-devicons/icons-default.lua` and `lua/nvim-web-devicons/icons-light.lua`
@@ -150,9 +140,9 @@ See also [The Conventional Commits ultimate cheatsheet](https://gist.github.com/
 
 ## Browser Font
 
-It is useful to see the actual glyphs in the pull request. That can be done by setting the browser font to your Nerd Font.
+It is useful to see the actual glyphs in the pull request. That can be done by setting the browser font to your nerd font.
 
-Using Firefox:
+Using firefox:
 
 - Settings -> General
 - Fonts -> Advanced