Changes:
- Edits templates for succinctness and precision
- Separate section for screenshots and OS/browser for bugs
- Removes requirements and TODO section of features to simplify
interface for external-facing requests
Part of #1241
### Changes
- Renames all instances of "Browsertrix Cloud" to "Browsertrix" on the
front end, emails, and documentation
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Co-authored-by: emma <hi@emma.cafe>
