Moved roundup-tracker.org infrastructure docs to website/README.txt This change makes developers.txt as the place for people contributing to the code base and README.txt to those maintaining the infrastructure. The old state was website/README.txt had reference to doc/developers.txt for updating issues.roundup-tracker.org. Removed reference and move docs to website/README.txt. doc/developers.txt had a section on updating website and wiki that referenced website/README.txt. Removed section, replaced with sentence that references website/README.txt for all infrastructure.

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