I've never seen anyone place a .gitignore file in the .git subdirectory before. As far as I know, it should be in the root if you wish to apply the rules to the entire repository.
GitHub say the following:
Note that you can create a .gitignore in any subpath to have its rules
applied at that path. Sometimes an empty .gitignore file is used as a
placeholder for an empty path, for example to force git to generate a
log/ path for your development environment to use.
Going by that logic, all those rules will all be applied from the .git folder downwards. I can see what you're trying to do, but I've never seen it done before that way.
I would put the .gitignore in the root of the repository, and have it look like this:
www/analytics
venv/bin
venv/build
venv/include
venv/lib
venv/local
*.pyc
I'd expect that to do the right thing.
In addition, it is worth bearing this in mind:
Note that git will not ignore a file that was already tracked before a
rule was added to this file to ignore it. In such a case the file must
be un-tracked, usually with git rm --cached filename
You will possibly need to do that, if you've added older versions of those files you wish to ignore.