Restructure wallet docs to prep for app wallet content (#9088)

automerge

docs/src/wallet/README.md

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+# Solana Wallet
+This document describes the different wallet options that are available to users
+of Solana who want to be able to send, receive and interact with
+SOL tokens on the Solana blockchain.

docs/src/wallet/app-wallets.md

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+Documentation of supported for App Wallets coming soon!

docs/src/wallet/cli-wallets.md

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+# Command Line Wallets
+
+Solana supports several different types of wallets that can be used to interface
+directly with the Solana command-line tools.
+
+**If you are unfamiliar with using command line programs and just want to be able
+to send and receive SOL tokens, we recommend setting up a third-party
+[Web Wallet](app-wallets.md)**.
+
+To use a Command Line Wallet, you must first [install the Solana CLI tools](../cli/install-solana-cli-tools.md)
+
+## File System Wallet
+
+A *file system wallet*, aka an FS wallet, is a directory in your computer's
+file system. Each file in the directory holds a keypair.
+
+### FS Wallet Security
+
+An FS wallet is the most convenient and least secure form of wallet. It is
+convenient because the keypair is stored in a simple file. You can generate as
+many keys as you would like and trivially back them up by copying the files. It
+is insecure because the keypair files are **unencrypted**. If you are the only
+user of your computer and you are confident it is free of malware, an FS wallet
+is a fine solution for small amounts of cryptocurrency. If, however, your
+computer contains malware and is connected to the Internet, that malware may
+upload your keys and use them to take your tokens. Likewise, because the
+keypairs are stored on your computer as files, a skilled hacker with physical
+access to your computer may be able to access it. Using an encrypted hard
+drive, such as FileVault on MacOS, minimizes that risk.
+
+## Paper Wallet
+
+A *paper wallet* is a collection of *seed phrases* written on paper. A seed
+phrase is some number of words (typically 12 or 24) that can be used to
+regenerate a keypair on demand.
+
+### Paper Wallet Security
+
+In terms of convenience versus security, a paper wallet sits at the opposite
+side of the spectrum from an FS wallet. It is terribly inconvenient to use, but
+offers excellent security. That high security is further amplified when paper
+wallets are used in conjunction with
+[offline signing](../offline-signing/index.md). Custody services such as
+[Coinbase Custody](https://custody.coinbase.com/) use this combination.  Paper wallets
+and custody services are an excellent way to secure a large number of tokens
+for a long period of time.
+
+## Hardware Wallet
+
+A hardware wallet is a small handheld device that stores keypairs and provides
+some interface for signing transactions.
+
+### Hardware Wallet Security
+
+A hardware wallet, such as the
+[Ledger hardware wallet](https://www.ledger.com/), offers a great blend of
+security and convenience for cryptocurrencies. It effectively automates the
+process of offline signing while retaining nearly all the convenience of an FS
+wallet.
+
+## Which Wallet is Best?
+
+Different people will have different needs, but if you are still unsure what
+is best for you after reading the comparisons above, go with a
+[Ledger Nano S](https://shop.ledger.com/products/ledger-nano-s). The
+[Nano S is well-integrated into Solana's tool suite](../remote-wallet/ledger.md)
+and offers an outstanding blend of security and convenience.