Me: update credit card section with more info

[v18]

When a user has no credit cards on file they see this screen:

You can get to this screen by following these steps:

1. Go to Me > Manage Purchases
2. Go to the Billing History tab

Here's the url: https://wordpress.com/me/billing

Instead, we should:

• allow user to add new cards directly from here

Additionally, we should add this both when there are CCs saved and when there's none:

• show a message explaining that auto-renewal with previous cards still go through, even if there are no cards shown on this page
• link to My Upgrades to manage existing upgrades

[stephanethomas]

@gziolo, I think this has been resolved, right?

[gziolo]

@stephanethomas: Yes, to the link part :)

There are also 2 other items listed.

show a message explaining that auto-renewal with previous cards still go through, even if there are no cards shown on this page

@peterbutler What do we plan to do about it?

[stale]

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