Update signcolumn, show diagnostics colored line numbers, remove

diagnostics signs from column. Remove tiny inline diagnostics and
re-enable virtual text with a circle icon instead of a box icon.
from c

nvim/lua/diagnostics.lua

@@ -0,0 +1,37 @@
+local colors = require("ayu.colors")
+colors.generate(true)
+-- These are not apart of the Ayu color theme, however, I needed these
+-- colors while still fitting in with the rest
+local ayu_turquoise = "#5CCFE6"
+local ayu_dark_blue = "#3A7BD5"
+for _, highlight in ipairs({
+    { "DiagnosticUnderlineError", { undercurl = true, sp = colors.error } },
+    { "DiagnosticUnderlineWarn",  { undercurl = true, sp = colors.warning } },
+    { "DiagnosticUnderlineHint",  { undercurl = true, sp = ayu_turquoise } },
+    { "DiagnosticUnderlineInfo",  { undercurl = true, sp = ayu_dark_blue } },
+}) do
+    vim.api.nvim_set_hl(0, highlight[1], highlight[2])
+end
+
+local sev = vim.diagnostic.severity
+vim.diagnostic.config({
+    underline = true,
+    virtual_text = {
+        prefix = "●",
+    },
+    update_in_insert = true,
+    signs = {
+        text = {
+            [sev.ERROR] = "",
+            [sev.WARN] = "",
+            [sev.INFO] = "",
+            [sev.HINT] = "",
+        },
+        numhl = {
+            [sev.WARN] = "WarningMsg",
+            [sev.ERROR] = "ErrorMsg",
+            [sev.INFO] = "DiagnosticInfo",
+            [sev.HINT] = "DiagnosticHint",
+        },
+    },
+})