[docs] replace all GO snippets with collapsible blocks

docs/app-development.rst

@@ -194,7 +194,13 @@ through all transactions in the mempool, removing any that were included
 in the block, and re-run the rest using CheckTx against the post-Commit
 mempool state.
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         func (app *DummyApplication) CheckTx(tx []byte) types.Result {
           return types.OK
@@ -293,7 +299,13 @@ It is expected that the app will persist state to disk on Commit. The
 option to have all transactions replayed from some previous block is the
 job of the `Handshake <#handshake>`__.
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         func (app *DummyApplication) Commit() types.Result {
           hash := app.state.Hash()
@@ -311,7 +323,13 @@ The app should remember the latest height and header (ie. from which it
 has run a successful Commit) so that it can tell Tendermint where to
 pick up from when it restarts. See information on the Handshake, below.
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         // Track the block hash and header information
         func (app *PersistentDummyApplication) BeginBlock(params types.RequestBeginBlock) {
@@ -334,7 +352,13 @@ EndBlock response. To remove one, include it in the list with a
 validator set. Note validator set changes are only available in v0.8.0
 and up.
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         // Update the validator set
         func (app *PersistentDummyApplication) EndBlock(height uint64) (resEndBlock types.ResponseEndBlock) {
@@ -362,7 +386,13 @@ cause Tendermint to not connect to the corresponding peer:
 
 Note: these query formats are subject to change!
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         func (app *DummyApplication) Query(reqQuery types.RequestQuery) (resQuery types.ResponseQuery) {
           if reqQuery.Prove {
@@ -407,7 +437,13 @@ the app are synced to the latest block height.
 If the app returns a LastBlockHeight of 0, Tendermint will just replay
 all blocks.
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         func (app *DummyApplication) Info(req types.RequestInfo) (resInfo types.ResponseInfo) {
           return types.ResponseInfo{Data: cmn.Fmt("{\"size\":%v}", app.state.Size())}
@@ -420,7 +456,13 @@ Genesis
 initial validator set. Later on, it may be extended to take parts of the
 consensus params.
 
-::
+.. container:: toggle
+
+    .. container:: header
+
+        **Show/Hide Go Example**
+
+    .. code-block:: go
 
         // Save the validators in the merkle tree
         func (app *PersistentDummyApplication) InitChain(params types.RequestInitChain) {