rename bracket-push to matching-brackets

[petertseng]

This rename was proposed in:
exercism/problem-specifications#1501

The rationale for the name is:

• to name the exercise by its story, not by what it potentially teaches
• to avoid unnecessarily biasing the solution space

During a transitionary period where some tracks have named this exercise
matching-brackets and some bracket-push, it is helpful if both variants
can have the icon show up in the exercise list.

So, symlink the new name to the old name.
(not applicable; instead, files were uploaded to S3)

When (if?) all tracks complete the rename, the symlinks old files can be deleted from S3.

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Open to discussion on whether the old names should be symlinks or copies or something else (not present at all?)

[iHiD]

Thank you. The symlinks won't work because the icons actually get manually uploaded to s3. If you remove the symlinks I will merge the rename though. I've added duplicates on s3 for now.

[petertseng]

I interpreted your message to mean the symlinks should be removed and that no files with the name bracket-push should remain in their place at all. If I have misunderstood and you instead meant that the files should remain, just say the word.

[iHiD]

This is great. Thanks :)