Updated SearchSwap page with v1.0.0 updates

[gusper]

This pull request includes updates to the content/software/searchswap/index.md file to improve the clarity and functionality of the documentation for the SearchSwap browser extension. The most important changes include improving user instructions and adding information about new features.

Documentation updates:

• Updated the browser support statement to consider adding support for other browsers based on demand.
• Enhanced user instructions by suggesting users pin the SearchSwap extension to the toolbar for easier access.
• Added information about a new Options page that allows users to manage their list of sites, including adding, deleting, and modifying sites.
• Adjusted image sizes to improve visual clarity and user experience.