Re-organize Learn Pages

[Mephistic]

Goal

We want to re-organize our Learn pages so that new users can more readily get up to speed on what MAPLE is and how to use the site.

Success Criteria

• Move “Communicating with Legislators” to be the 4th tab on the Basics of Testimony page - replacing the section “The MA Legislative Process”
• Move the section “The MA Legislative Process” from the Basics of Testimony Page to a stand alone page under the Learn section of the header menu
• Move the contents of “Additional Resources” (https://www.mapletestimony.org/learn/additional-resources) to the bottom of the "The MA Legislative Process" page
• Rename “Basics of Testimony” to “To Write Effective Testimony”
• Rename “The MA Legislative Process” to “About the MA Legislative Process"

The end state of the header menu should be: (This issue only covers the "Learn" section)

    Home
    Browse Testimony
    Browse Bills
    About MAPLE
    - Mission & Goals
    - Team
    - Support MAPLE
    - FAQ
    Learn
    - To Write Effective Testimony
    - About the Legislative Process
    - Why Use MAPLE

Additional Links
Figma: https://www.figma.com/file/xgEgPpUqzJP4fPk4uRbulq/MAPLE-Design-Library?type=design&node-id=0-1&mode=design&t=cQTooxCIoqRwG6Yq-11
Parent Issue: #1489