docs: improved docs for playwright install, added instructions for ly…

…nx browser backend

gptme/tools/browser.py

@@ -2,19 +2,39 @@
 Tools to let the assistant control a browser, including:
  - loading pages
  - reading their contents
- - viewing them through screenshots
- - searching
+ - searching the web
+ - taking screenshots (Playwright only)
 
-.. note::
+Two backends are available:
 
-    This is an experimental feature. It needs some work to be more robust and useful.
+Playwright backend:
+ - Full browser automation with screenshots
+ - Installation:
+
+   .. code-block:: bash
+
+       pipx install 'gptme[browser]'
+       # We need to use the same version of Playwright as the one installed by gptme
+       # when downloading the browser binaries.
+       PW_VERSION=$(pipx runpip gptme show playwright | grep Version | cut -d' ' -f2)
+       pipx run playwright==$PW_VERSION install chromium
 
-To use the browser tool, you need to have the `playwright` Python package installed along with gptme, which you can install with:
+Lynx backend:
+ - Text-only browser for basic page reading and searching
+ - No screenshot support
+ - Installation:
 
-.. code-block:: bash
+   .. code-block:: bash
 
-    pipx install 'gptme[browser]'
-    gptme '/shell playwright install chromium'
+       # On Ubuntu
+       sudo apt install lynx
+       # On macOS
+       brew install lynx
+       # or any other way that gets you the `lynx` command
+
+.. note::
+
+    This is an experimental feature. It needs some work to be more robust and useful.
 """
 
 import importlib.util