refactor: use useManifest in Gov

Walkthrough

The changes in this pull request focus on the Governance component within the index.tsx file, where the useManifest hook is introduced to replace the previous method of fetching the manifest from a JSON file. This transition simplifies the data flow by removing the fetchJson function and its associated useEffect. The manifest state is now directly initialized using the useManifest hook, and the rendering logic has been adjusted accordingly. Additionally, a minor formatting change was made in the useManifest function declaration.

Changes

File Path	Change Summary
`packages/extension-polkagate/src/fullscreen/governance/index.tsx`	- Updated import to include `useManifest` hook. - Removed `fetchJson` function and `useEffect` for manifest fetching. - Initialized `manifest` state using `useManifest()`. - Adjusted rendering logic to use `manifest` for displaying application version and governance support.
`packages/extension-polkagate/src/hooks/useManifest.ts`	- Minor formatting change in the function declaration of `useManifest`.

Possibly related PRs

#1557: This PR introduces the SimpleModalTitle component, which is relevant to the main PR as it also involves changes in the governance components, specifically in how titles are rendered in modals.
#1622: This PR addresses issues related to the displaying of deciding counts for governance tracks, which may connect to the overall governance functionality being modified in the main PR.

Suggested labels

change requested

Poem

In the land of governance, changes unfold,
A hook for the manifest, a story retold.
No more fetching, just a simple call,
The version displayed, we’ll share with all!
With each little tweak, our code grows bright,
Hopping along, we’ll code through the night! 🐇✨

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PolkaGate / extension