Simple TACo images

[derekpierre]

Short-term quick and dirty fixes for TACo application images.

In the medium/longer-term the original png images should be provided as SVG images so that they can more easily be edited.

• Fixes TACo specific images #677
• Related to When de-authing, fix image and cooldown period #679
• Fixes Main Staking Page image still shows PRE #681

Notes for reviewers:
I'm less familiar with this codebase, so if I missed anything let me know.

[derekpierre]

@theref not sure what's up with CI - could you take a look?

[piotr-roslaniec]

@derekpierre You need to update the yarn.lock lockfile with yarn install. I've tried doing it myself but I don't have write access to your branch.

[cygnusv]

@theref not sure what's up with CI - could you take a look?
@derekpierre You need to update the yarn.lock lockfile with yarn install. I've tried doing it myself but I don't have write access to your branch.

Apart from this, in this repo we need to create PRs from branches, not from forks, so CI works properly

[piotr-roslaniec]

@cygnusv I think we need some permissions to push to the origin branches

ERROR: Permission to threshold-network/token-dashboard.git denied to piotr-roslaniec.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

[derekpierre]

Closed in favour of #686