You can always keep using the link in your browser. Installing just adds an icon so it opens like any other app, and pages you have seen stay readable without internet.
Android phone or tabletthis device
Open this page in Chrome.
Tap the ⋮ menu at the top right.
Tap Install app or Add to Home screen.
Tap Install.
iPhone or iPadthis device
Open this page in Safari.
Tap the Share button (a square with an arrow pointing up).
Scroll down and tap Add to Home Screen.
Tap Add at the top right.
Windows or Linux computerthis device
Open this page in Chrome or Edge.
Click the install icon at the right end of the address bar (a small screen with a down arrow), or open the menu and choose Install.
Click Install. It appears in your Start menu or app list.
Firefox cannot install web apps; use Chrome or Edge for this step.
Macthis device
In Safari: open the File menu and choose Add to Dock.
Or in Chrome: click the install icon at the right end of the address bar.