feat(extras): add fish themes

extras/fish/Sweetie Dark.theme

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+# name: 'Sweetie dark'
+# url: 'https://github.com/NTBBloodbath/sweetie.nvim'
+# preferred_background: 2a2a3a
+
+fish_color_normal fdfffd
+fish_color_command 6ad7ff
+fish_color_param d5b0ff
+fish_color_keyword 6ad7ff
+fish_color_quote 85ff72
+fish_color_redirection eeffee
+fish_color_end f4b47c
+fish_color_comment 929292
+fish_color_error e78888
+fish_color_gray 929292
+fish_color_selection --background=37374c
+fish_color_search_match --background=232331
+fish_color_option 85ff72
+fish_color_operator d5b0ff
+fish_color_escape d5b0ff
+fish_color_autosuggestion 78789d
+fish_color_cancel e78888
+fish_color_cwd f4b47c
+fish_color_user 70ffec
+fish_color_host_remote 85ff72
+fish_color_host 6ad7ff
+fish_color_status ffe24f
+fish_pager_color_progress 37374c
+fish_pager_color_prefix e7aeff
+fish_pager_color_completion eeffee
+fish_pager_color_description 37374c

extras/fish/Sweetie Light.theme

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+# name: 'Sweetie light'
+# url: 'https://github.com/NTBBloodbath/sweetie.nvim'
+# preferred_background: dddde7
+
+fish_color_normal 202023
+fish_color_command 0c5090
+fish_color_param 9437ff
+fish_color_keyword 0c5090
+fish_color_quote 287f0d
+fish_color_redirection 18181a
+fish_color_end ae580e
+fish_color_comment 8989a9
+fish_color_error b31919
+fish_color_gray 8989a9
+fish_color_selection --background=bbbbce
+fish_color_search_match --background=ccccda
+fish_color_option 287f0d
+fish_color_operator 9437ff
+fish_color_escape 9437ff
+fish_color_autosuggestion 78789d
+fish_color_cancel b31919
+fish_color_cwd ae580e
+fish_color_user 47948a
+fish_color_host_remote 287f0d
+fish_color_host 0c5090
+fish_color_status 957d09
+fish_pager_color_progress bbbbce
+fish_pager_color_prefix a00c79
+fish_pager_color_completion 18181a
+fish_pager_color_description bbbbce