Remove docs about --before and --then flags since they are not planned anymore

Author: f-f

README.md

@@ -343,24 +343,6 @@ are ES modules, and you can just `import` them e.g. on Node.
 > $ spago build --output myOutput
 > ```
 
-To run a command before a build you can use the `--before` flag, eg to post a notification that a build has started:
-
-```console
-$ spago build --before "notify-send 'Building'"
-```
-
-To run a command after the build, use `--then` for successful builds, or `--else` for unsuccessful builds:
-
-```console
-$ spago build --then "notify-send 'Built successfully'" --else "notify-send 'Build failed'"
-```
-
-Multiple commands are possible - they will be run in the order specified:
-
-```console
-$ spago build --before clear --before "notify-send 'Building'"
-```
-
 If you want to run the program, just use `run`:
 
 ```console

test/Spago/Build.purs

@@ -247,61 +247,3 @@ spec = Spec.around withTempDir do
     Monorepo.spec
 
     BuildInfo.spec
-
--- Spec.it "runs a --before command" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   let dumpFile = "testOutput"
---   spago [ "build", "--before", "echo before>> " <> dumpFile ] >>= shouldBeSuccess
---   test <- FS.readTextFile dumpFile
---   test `Assert.shouldEqual` "before"
-
--- Spec.it "runs a --then command" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   let dumpFile = "testOutput"
---   spago [ "build", "--then", "echo then>> " <> dumpFile, "--else", "echo else>> " <> dumpFile ] >>= shouldBeSuccess
---   test <- FS.readTextFile dumpFile
---   test `Assert.shouldEqual` "then"
-
--- Spec.it "runs a --before command before a --then command" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   let dumpFile = "testOutput"
---   spago [ "build", "--before", "echo before>> " <> dumpFile, "--then", "echo then>> " <> dumpFile ] >>= shouldBeSuccess
---   test <- FS.readTextFile dumpFile
---   test `Assert.shouldEqual` "before\nthen"
-
--- Spec.it "runs an --else command if there is an error in the build" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   let dumpFile = "testOutput"
---   FS.writeTextFile "src/Main.purs" "Invalid Purescript code"
---   spago [ "build", "--then", "echo then>> " <> dumpFile, "--else", "echo else>> " <> dumpFile ] >>= shouldBeFailure
---   test <- FS.readTextFile dumpFile
---   test `Assert.shouldEqual` "else"
-
--- Spec.it "runs an --else command if there is an error in the run file" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   spago [ "install", "exceptions" ] >>= shouldBeSuccess
---   let dumpFile = "testOutput"
---   FS.writeTextFile "src/Main.purs" "module Main where\nimport Effect.Exception\nmain = throw \"error\""
---   spago [ "run", "--else", "echo else>> " <> dumpFile ] >>= shouldBeFailure
---   test <- FS.readTextFile dumpFile
---   test `Assert.shouldEqual` "else"
-
--- Spec.it "runs multiple commands in order" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   let dumpFile = "testOutput"
---   spago [ "build", "--before", "echo before1>> " <> dumpFile, "--before", "echo before2>> " <> dumpFile, "--then", "echo then1>> " <> dumpFile, "--then", "echo then2>> " <> dumpFile ] >>= shouldBeSuccess
---   test <- FS.readTextFile dumpFile
---   test `Assert.shouldEqual` "before1\nbefore2\nthen1\nthen2"
-
--- Spec.it "fails the build if a --before command fails" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   spago [ "build", "--before", "exit 1" ] >>= shouldBeFailure
-
--- Spec.it "fails the build if a --then command fails" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   spago [ "build", "--then", "exit 1" ] >>= shouldBeFailure
-
--- Spec.it "still fails the build if an --else command fails" \{ spago } -> do
---   spago [ "init" ] >>= shouldBeSuccess
---   FS.writeTextFile "src/Main.purs" "Invalid Purescript code"
---   spago [ "build", "--else", "exit 1" ] >>= shouldBeFailure