add the old snippet md files

old_snippets/vim-substitute.en.md

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+---
+title: "replae <s> with spell and nohl"
+date: 2020-01-11T12:57:46+01:00
+draft: false
+snippet_types: ["vim"]
+---
+
+When is the last time you used the **\<s>** key in vim? May not know what it even does?
+
+The vim help pages lists it as substitute:
+
+```
+4.2 Substitute						*:substitute*
+							*:s* *:su*
+:[range]s[ubstitute]/{pattern}/{string}/[flags] [count]
+```
+
+In real use I find this visual selection putting or using **\<c>** along with movement keys much
+better for substituting text. This leave the s key in normal mode open to be remapped! Here are two
+mappings I have so far:
+
+- turn off highlighting with a quick **\<s>\<s>**
+```vim script
+nnoremap ss :noh<CR>
+```
+
+- turn on spell check in a given language
+```vim script
+nnoremap <leader>se :setlocal spell spelllang=en<CR>
+nnoremap <leader>sd :setlocal spell spelllang=de<CR>
+```
+
+