Move pages under tldr, lint run.sh, update docs

tldr/doctl-serverless

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doctl serverless
+
+> Manage serverless functions.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/serverless/>.
+
+- Connect local serverless support to a functions namespace:
+
+`doctl serverless connect`
+
+- Deploy a functions project to your functions namespace:
+
+`doctl serverless deploy`
+
+- Obtain metadata of a functions project:
+
+`doctl serverless get-metadata`
+
+- Provide information about serverless support:
+
+`doctl serverless status`