docs: theme config and list of theme templates (#116)

- Added theme configuration guide in README
- Added some theme templates
- Added list of theme templates in `themes/`

themes/README.md

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+# Theme templates
+
+> [!IMPORTANT]
+> This directory is reserved for theme templates only!
+> When contributing, please:
+> - Only add new color schemes
+> - Do not add unrelated files
+> - Check that the color scheme doesn't already exist before submitting
+
+### [Gruvbox](./gruvbox.toml)
+<table>
+  <td>
+    <img width="1357" height="411" alt="image" src="https://github.com/user-attachments/assets/97cfb7d7-e998-46a7-b714-2764da5df148" />
+  </td>
+  <td>
+    <img width="1354" height="488" alt="image" src="https://github.com/user-attachments/assets/691f9eeb-7996-41dc-b2fe-fac1d2d23942" />
+  </td>
+</table>
+
+### [Tokyo Night](./tokyo-night.toml)
+<table>
+  <td>
+    <img width="1222" height="418" alt="image" src="https://github.com/user-attachments/assets/29d61d17-f1e2-4fd4-9cfe-403ba251d867" />
+  </td>
+  <td>
+    <img width="1229" height="432" alt="image" src="https://github.com/user-attachments/assets/459f1794-2220-420f-9c4c-3db326b2c14d" />
+  </td>
+</table>
+
+### [Catppuccin Mocha](./catppuccin-mocha.toml)
+<table>
+  <td>
+    <img width="1283" height="414" alt="image" src="https://github.com/user-attachments/assets/01d9581b-cebe-4fac-870b-0fa52bd3398d" />
+  </td>
+  <td>
+    <img width="1272" height="437" alt="image" src="https://github.com/user-attachments/assets/a2edcb00-6f40-4d49-bf63-9f4dac9a1f27" />
+  </td>
+</table>
+
+### [Catppuccin Macchiato](./catppuccin-macchiato.toml)
+<table>
+  <td>
+    <img width="1203" height="432" alt="image" src="https://github.com/user-attachments/assets/cabf1405-bd6b-47a8-a9b8-dfbf391944dd" />
+  </td>
+  <td>
+    <img width="1259" height="445" alt="image" src="https://github.com/user-attachments/assets/e03aa500-a2c4-4c30-b839-62a4ca5e0e0d" />
+  </td>
+</table>
+
+### [Catppuccin Frappé](./catppuccin-frappe.toml)
+<table>
+  <td>
+    <img width="1219" height="437" alt="image" src="https://github.com/user-attachments/assets/4aa0daa8-56c4-4548-8cba-426a2561de70" />
+  </td>
+  <td>
+    <img width="1200" height="437" alt="image" src="https://github.com/user-attachments/assets/feba0246-3cc7-466d-8f53-ff27e7601002" />
+  </td>
+</table>
+
+### [Catppuccin Latte](./catppuccin-latte.toml)
+<table>
+  <td>
+    <img width="1205" height="422" alt="image" src="https://github.com/user-attachments/assets/587810e7-6010-45f0-b7ca-f29da9fa8b28" />
+  </td>
+  <td>
+    <img width="1203" height="421" alt="image" src="https://github.com/user-attachments/assets/49b4f397-b3a0-4a3b-84ae-56eb85a7096a" />
+  </td>
+</table>

themes/catppuccin-frappe.toml

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+border = "#ca9ee6"
+accent = "#81c8be"
+muted = "#737994"
+text = "#c6d0f5"
+text_sel = "#c6d0f5"
+key = "#ca9ee6"
+match = "#a6d189"
+desc = "#a5adce"
+desc_sel = "#c6d0f5"
+sel_bg = "#626880"
+sel_text = "#303446"
+scroll_info = "#ca9ee6"
+ghost_text = "#626880"
+sys = "#414559"
+sys_sel = "#ef9f76"
+hist = "#292c3c"
+hist_sel = "#81c8be"
+alias = "#414559"
+alias_sel = "#ca9ee6"

themes/catppuccin-latte.toml

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+border = "#eff1f5"
+accent = "#179299"
+muted = "#9ca0b0"
+text = "#cdd6f4"
+text_sel = "#4c4f69"
+key = "#dc8a78"
+match = "#179299"
+desc = "#a6adc8"
+desc_sel = "#4c4f69"
+sel_bg = "#ccd0da"
+sel_text = "#eff1f5"
+scroll_info = "#dc8a78"
+ghost_text = "#9ca0b0"
+sys = "#24273a"
+sys_sel = "#fe640b"
+hist = "#e6e9ef"
+hist_sel = "#179299"
+alias = "#24273a"
+alias_sel = "#ea76cb"

themes/catppuccin-macchiato.toml

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+border = "#c6a0f6"
+accent = "#8bd5ca"
+muted = "#6e738d"
+text = "#cad3f5"
+text_sel = "#cad3f5"
+key = "#c6a0f6"
+match = "#a6da95"
+desc = "#a5adcb"
+desc_sel = "#cad3f5"
+sel_bg = "#5b6078"
+sel_text = "#24273a"
+scroll_info = "#c6a0f6"
+ghost_text = "#5b6078"
+sys = "#363a4f"
+sys_sel = "#f5a97f"
+hist = "#1e2030"
+hist_sel = "#8bd5ca"
+alias = "#363a4f"
+alias_sel = "#c6a0f6"

themes/catppuccin-mocha.toml

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+border = "#cba6f7"
+accent = "#94e2d5"
+muted = "#6c7086"
+text = "#cdd6f4"
+text_sel = "#cdd6f4"
+key = "#cba6f7"
+match = "#a6e3a1"
+desc = "#a6adc8"
+desc_sel = "#cdd6f4"
+sel_bg = "#585b70"
+sel_text = "#1e1e2e"
+scroll_info = "#cba6f7"
+ghost_text = "#585b70"
+sys = "#313244"
+sys_sel = "#fab387"
+hist = "#181825"
+hist_sel = "#94e2d5"
+alias = "#313244"
+alias_sel = "#cba6f7"