change cpr-dev to NOT be a template (I think?) and update README setup steps

the problem is that templates don't have a commit history, so pulling updates from upstream sucks.

maybe if we make this change we would also want to change the forked repo to no longer be a fork (either programmatically if possible? or by instructing the developer in Setup steps in README). in this case, would we need to manually add the upstream remote, or will it already exist or?

首先检查 README 中的设置步骤以及该 repository 当前的 template 和 fork 工作流。确定该 repository 是否应停止作为 template 或 fork，并记录所需的 upstream 设置；当所选工作流清晰明确且 README 能够准确引导开发者完成该工作流时，即视为完成。