home: vim: lspconfig: add 'harper'

Support for more languages is upcoming, I also need to check how to
handle custom words/dictionaries.

modules/home/vim/plugin/settings/lspconfig.lua

@@ -96,6 +96,13 @@ if utils.is_executable("starpls") then
 end
 
 -- Generic
+if utils.is_executable("harper-ls") then
+    lspconfig.harper_ls.setup({
+        capabilities = capabilities,
+        on_attach = lsp.on_attach,
+    })
+end
+
 if utils.is_executable("typos-lsp") then
     lspconfig.typos_lsp.setup({
         capabilities = capabilities,