Edited the Programmable Banking page & Investec intro

[shannagh11]

open-banking-intro.md edits:

• Moved the position of Programmable Banking to position 3 in the wiki
• Added in the Investec Private Bank CVP
• Added banners

programmable-banking.md edits

• Separated out the Programmable Banking community page
• Added banners

about-investec.md edits:

• Added a CTA in the about-investec page

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Name	Status	Preview	Updated
developers-finance	✅ Ready (Inspect)	Visit Preview	Jun 26, 2022 at 1:19PM (UTC)