Misleading tip regarding SVN in README.md

[bloomstick]

In README.md, the tip for using SVN to minimize download size is misleading for the current state of GitHub, as for Jan 8, 2024 they have sunset Subversion support for the platform.

Now, trying to checkout the example repository following the instructions, leads to the following result:

svn co https://github.com/flutter/samples/trunk/provider_shopper
svn: E170013: Unable to connect to a repository at URL 'https://github.com/flutter/samples/trunk/provider_shopper'
svn: E160013: '/flutter/samples/trunk/provider_shopper' path not found

I propose removing the tip regarding usage of SVN from README.md completely, or adding a statement notifying the reader of the unavailability of this method of getting a particular subfolder of the repository.