fix links in getting started guide

docs/_getting-started/index.md

@@ -8,29 +8,36 @@ To use Geth, you need to install it first. You can install the geth software in
 of ways. These include installing it via your favorite package manager; downloading a
 standalone pre-built binary; running as a docker container; or building it yourself.
 
-Head over to the [install and build](/install-and-build/Installing-Geth) section and
+Head over to the [install and build](./install-and-build/installing-geth) section and
 follow the instructions for your operating system.
 
 ## Starting a node
 
 ### Create an account
 
-Before starting Geth you first need to create an account that represents a key pair. Use the following command to create a new account and set a password for that account:
+Before starting Geth you first need to create an account that represents a key pair. Use
+the following command to create a new account and set a password for that account:
 
 ```shell
 geth account new
 ```
 
-_[Read this guide](/interface/Managing-your-accounts) for more details on importing existing Ethereum accounts and other uses of the `account` command._
+_[Read this guide](./interface/managing-your-accounts) for more details on importing
+existing Ethereum accounts and other uses of the `account` command._
 
 ### Sync modes
 
-Running Geth starts an Ethereum node that can join any existing network, or create a new one. You can start Geth in one of three different sync modes using the `--syncmode "{mode}"` argument that determines what sort of node it is in the network.
+Running Geth starts an Ethereum node that can join any existing network, or create a new
+one. You can start Geth in one of three different sync modes using the `--syncmode
+"{mode}"` argument that determines what sort of node it is in the network.
 
 These are:
 
--   **Full**: Downloads all blocks (including headers, transactions and receipts) and generates the state of the blockchain incrementally by executing every block.
+-   **Full**: Downloads all blocks (including headers, transactions and receipts) and
--   **Fast** (Default): Downloads all blocks (including headers, transactions and receipts), verifies all headers, and downloads the state and verifies it against the headers.
+    generates the state of the blockchain incrementally by executing every block.
+-   **Fast** (Default): Downloads all blocks (including headers, transactions and
+    receipts), verifies all headers, and downloads the state and verifies it against the
+    headers.
 -   **Light**: Downloads all block headers, block data, and verifies some randomly. 
 
 For example:
@@ -41,13 +48,15 @@ geth --syncmode "light"
 
 ### Connect to node
 
-Once you have an account and Geth is running, you can interact with it by opening another terminal and using the following command to open a JavaScript console:
+Once you have an account and Geth is running, you can interact with it by opening another
+terminal and using the following command to open a JavaScript console:
 
 ```shell
 geth attach
 ```
 
-In the console you can issue any of the Geth commands, for example, to list all the accounts on the node, use:
+In the console you can issue any of the Geth commands, for example, to list all the
+accounts on the node, use:
 
 ```shell
 eth.accounts