Remove Quartus2 template

The template hasn't been touched since it was added to this collection.
There are some problems with it - mainly that it's hard to know if these
rules are all still relevant, and the large prose block is probably more
confusing than helpful here.
Add 'build' directory
Adding additional comments

Adding additional comments so that folks know to use the integration tool rather than copying this for better results.
Update Dart.gitignore

add the `.pub/` directory, and change the `packages` filter to match sub-folders.
Merge pull request #1205 from jlgrock/master

Adding additional comments
Merge pull request #1206 from devoncarew/patch-2

Update Dart.gitignore
Merge pull request #1198 from nicwortel/symfony-build

Add 'build' directory to Symfony.gitignore
Merge pull request #1193 from github/remove-quartus2

[Global/Quartus2] Remove template