TYPO: Update installing.md uninstall command

[nikisix]

No description provided.

[github-actions]

👈 Launch a binder notebook on branch nikisix/jupyterlab-vim/patch-1

[firai]

@ianhi @krassowski Should we delete installing.md and mention of "JupyterLab <3", i.e. JupyterLab 2, in README altogether? It seems to me that the duplication of information is cause of this typo.

[krassowski]

I agree with the idea of deleting it, the less duplication the better.

[firai]

Hi @nikisix, thanks for noticing the typo and submitting the PR! Since the extra installation.md only exists to provide JL 2 extension instructions and since JL 2 is quite old now, we think it may be best to delete this file altogether. I hope you don't mind us modifying your PR to do so.

[firai]

Sorry, I didn't notice that a rebase would be required, which is probably more work than it's worth. I have opened a new PR at #121. Please take a look.

I'll close this PR. Thanks for your contribution!