Fix broken V2 bug bounty link + add security and glossary pages for V3 and V4.

[RohanNero]

Changes

V2

• Old link: https://uniswap.org/bug-bounty/
• New link: https://cantina.xyz/bounties/f9df94db-c7b1-434b-bb06-d1360abdd1be

According to this blog post, the Cantina bug bounty program's scope includes all Uniswap contracts.

V3

Added an updated glossary.md file.

• Removed old terms such as Constant product formula, Invariant, and x * y = k
• Added new terms such as Concentrated liquidity, Tick interval, and ticks.

Added a security.md file with a link to the Cantina bug bounty and relevant V3 audit reports:

• ABDK Consulting's V3 core contracts audit report.
• ABDK Consulting's V3 periphery contracts audit report.
• Trail of Bits' V3 core contracts audit report.

V4

Added an updated glossary.md file.

• Removed old terms such as Factory and Pair.
• Added new terms such as Flash accounting, Dynamic fees, Pool key, Pool manager, and Singleton Design.

Added a security.md file with a link to the Cantina bug bounty, November 2024 V4 bug bounty blog post, and audit reports.

• Uniswap V4 core audits.
• Uniswap V4 periphery audits.