create "Tasks" section on docs site (#715)

create tasks section in docs site

docs/docs/tasks/README.md

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+# Tasks
+
+Understand a bit more about each type of Open Assistant labeling task.
+
+- [Label Assistant Reply](label_assistant_reply.md)
+- [Label Prompter Reply](label_prompter_reply.md)
+- [Reply as Assistant](reply_as_assistant.md)
+- [Reply as User](reply_as_user.md)

docs/docs/tasks/label_assistant_reply.md

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+# Label Assistant Reply
+
+Given the following discussion, provide labels for the final prompt.

docs/docs/tasks/label_prompter_reply.md

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+# Label Prompter Reply
+
+Given the following discussion, provide labels for the final prompt.

docs/docs/tasks/reply_as_assistant.md

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+# Reply as Assistant
+
+Given the following conversation, provide an adequate reply.

docs/docs/tasks/reply_as_user.md

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+# Reply as User
+
+Given the following conversation, provide an adequate reply.