feat: add docs for APR calculation (#232)

* feat: add staking APR

* feat: try making equations appear

* feat: change to image

* feat: fix explanation

docs/overview/integrate/apr.md

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+---
+sidebar_position: 11
+---
+
+# APR Calculation
+
+## Introduction
+APR for each pools is a metric that indicates the expected annualized return on investment for liquidity providers. APRs are calculated differently for CL pools and normal pools due to their distinct operational mechanisms.
+
+## Concentrated Liquidity Pools
+
+### Calculation:
+- **APR for CL Pools**: 
+![](../../assets/apr-cl.png)
+Where:
+- **Spread Reward per Unit Liquidity**: This is the reward earned from the spread for providing liquidity, expressed per unit.
+- **Incentive Reward per Unit Liquidity**: This is any additional incentive reward for providing liquidity, also expressed per unit.
+- **Base Price**: The standardized value of one unit of liquidity in the pool, used to convert the reward values into a comparable base.
+- **Seconds in a Year**: Represents the total number of seconds in a year, used for annualizing the return. It's calculated as \( 365.25 \times 24 \times 60 \times 60 \) to account for leap years.
+- **Calculation Time Duration**: The duration in seconds over which the rewards were calculated 
+
+## CFMM Liquidity Pools(Balancer pools, Stableswap Pools)
+
+1. **Standard APR Calculation** (for 1 day, 7 days, and 14 days):
+   - The APR is calculated for each time frame using the formula:
+     ![](../../assets/apr-normal.png)
+   - Where:
+     - `Distribured Amount_timeframe` is the sum of distributed rewards for the time frame (1 day, 7 days, or 14 days).
+     - `Exponent` is a factor related to the coin denomination.
+     - `Liquidity` is the total liquidity in USD for the pool, adjusted by the percentage bonded (if applicable).
+     - `Coin Price` is the current price of the coin.
+     - The multiplier \(36500\) annualizes the rate.
+
+2. **Superfluid APR Calculation** (if applicable):
+   - The Superfluid APR is calculated additionally for pools where it's relevant, using the formula:
+    ![](../../assets/apr-superfluid.png)
+   - Where:
+     - \(\text{Staking APR}\) is the APR from staking.
+     - `Superfluid Percentage` is the percentage of the pool that is superfluid.
+     - `Superfluid Risk Factor` is a risk adjustment factor.
+     - `APR_14d` is the 14-day APR calculated as above.