Build/better gen (#132)

* build: directly generate js libs to node_modules

Roll back stellar/soroban-example-dapp#122, but
keep `crowdfund-contract` and `abundance-token` in
`optionalDependencies`.

As I worked with the old version in earnest, iterating on a local copy
of the CLI and generating new JS libs over and over, the two-step
generate-to-.soroban, then install-to-node_modules wasn't working very
well. Probably because the new library wasn't being added until the
`postinstall` step, and the dependencies are optional.

Generating directly to `node_modules` feels dirty, but it works
consistently. At least in this version, you can still see the
dependencies listed in the `optionalDependencies` section, so they're
not quite as surprising/mysterious.

* build: try adding back optionalDeps

* build: update node; use preinstall and local deps

* Update package-lock.json

* work around a bug in the binding gen

---------

Co-authored-by: Chad Ostrowski <[email protected]>

.gitattributes

@@ -0,0 +1 @@
+package-lock.json linguist-generated=true -diff

.github/workflows/nodejs.yml

@@ -26,7 +26,7 @@ jobs:
     - run: cargo install_soroban
     - uses: actions/setup-node@v3
       with:
-        node-version: 18.x
+        node-version: 18.14.2
         cache: 'npm'
     - run: |
         mkdir -p .soroban-example-dapp

.nvmrc

@@ -1 +1 @@
-18
+>=18.14.2

components/molecules/form-pledge/index.tsx

@@ -29,14 +29,14 @@ function MintButton({ account, symbol, onComplete, decimals }: { decimals: numbe
   const [isSubmitting, setSubmitting] = useState(false)
 
   const displayAmount = 100
-  const amount = BigInt(displayAmount * 10**decimals)
+  const amount = BigInt(displayAmount * 10 ** decimals)
 
   return (
     <Button
       title={`Mint ${displayAmount} ${symbol}`}
       onClick={async () => {
         setSubmitting(true)
-        await abundance.mint({ to: account, amount }, { signAndSend: true })
+        await abundance.mint({ to: account, amount })
         setSubmitting(false)
         onComplete()
       }}
@@ -80,9 +80,7 @@ const FormPledge: FunctionComponent<IFormPledgeProps> = props => {
     try {
       await deposit({
         user: props.account,
-        amount: BigInt(amount * 10**decimals),
-      }, {
-        signAndSend: true
+        amount: BigInt(amount * 10 ** decimals),
       })
 
       setResultSubmit({