docs: Add a "Presets" page to the website (#783)

docs/presets/README.md

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+# Presets
+
+Here is a collection of community-submitted configuration presets for Starship.
+If you have a preset to share, please [submit a PR](https://github.com/starship/starship/edit/master/docs/presets/README.md) updating this file! 😊
+
+## Nerd Font Symbols
+
+This preset doesn't change anything except for the symbols used for each module.
+If emojis aren't your thing, this might catch your eye!
+
+![Screenshot of Nerd Font Symbols preset](/presets/nerd-font-symbols.png)
+
+### Prerequisites
+
+- A [Nerd Font](https://www.nerdfonts.com/) installed and enabled in your terminal (the example uses Fira Code Nerd Font)
+
+### Configuration
+
+```toml
+[aws]
+symbol = " "
+
+[battery]
+full_symbol = ""
+charging_symbol = ""
+discharging_symbol = ""
+
+[conda]
+symbol = " "
+
+[git_branch]
+symbol = " "
+
+[golang]
+symbol = " "
+
+[hg_branch]
+symbol = " "
+
+[java]
+symbol = " "
+
+[memory_usage]
+symbol = " "
+
+[nodejs]
+symbol = " "
+
+[package]
+symbol = " "
+
+[php]
+symbol = " "
+
+[python]
+symbol = " "
+
+[ruby]
+symbol = " "
+
+[rust]
+symbol = " "
+```