Revolutionizing Collaboration: Pull Request Template Gets a Major Makeover!

Streamlined and Simplified: New Changes Foster Inclusivity and Efficiency for Contributors!

Commit Details:

chore: Update pull request template (#2135) ## Why is this change needed? Our template is in need of a makeover. Made the following changes: - Change **Motivation** to **Why is this change needed?** to emphasize what we mean by Motivation. - Remove the **Change Summary** section since this is automatically summarized by PR-Codex bot. - Remove requirement to sign commits, since this doesn't provide any _real_ security and makes it slightly harder for contributors. Since GitHub doesn't prevent them from creating the PR in the first place if the HEAD commit isn't signed, we might as well allow it so we don't need to manually bypass. - Removed **Additional Context** section since this seemed superfluous. ## Merge Checklist - [x] PR title adheres to the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) standard - [ ] PR has a [changeset](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#35-adding-changesets) - [x] PR has been tagged with a change label(s) (i.e. documentation, feature, bugfix, or chore) - [x] PR includes [documentation](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#32-writing-docs) if necessary. <!-- start pr-codex --> --- ## PR-Codex overview This PR removes the `Change Summary` section from the pull request template and updates the checklist options. ### Detailed summary - Removed `Change Summary` section from PR template - Updated checklist options in PR template > ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}` <!-- end pr-codex -->