Some libraries in lib are server-only

[riccardobl]

Follow-up of #1727 (comment)
I am listing here the libraries in lib/ that cannot be used in the client because they depend on the Node environment.

• lib/proxy.js : imports node https and http
• lib/cln.js : imports lib/proxy
• lib/rss.js imports api/ssrApollo
• lib/lnd.js needs access to the filesystem

@huumn suggested that this code can go under api/lib.

Refactoring now would cause conflicts with the pending PRs, so I am using this issue to track them for a later time when there will be fewer pending changes.

[huumn]

I plan on spending most of my January paying off some of our technical debt. Reorging files should definitely be part of that.