Remove outdated page about bootstrap file

The bootstrap file is now loaded locally only.
If the user does not change the file, it should
always be loaded without any issues.

Author: ltoenning

docs/troubleshooting/bootstrap.md

@@ -9,10 +9,6 @@
 
 Read this [checklist](../home/checklist_first_flight.md)
 
-**Setup / bootstrap file trouble**
-
-See [Bootstrap file](./bootstrap.md).
-
 ***swift* does not start / connect**
 
 - Could be a Virus scanner/Security suite issue, maybe check if swift needs some permission there

docs/troubleshooting/first_install.md

@@ -156,7 +156,6 @@ nav:
       - swift user data: documentation/flying/swift_user_data.md
   - Troubleshooting:
     - troubleshooting/index.md
-    - Bootstrap file: troubleshooting/bootstrap.md
     - swift does not connect with XPlane on MacOS: troubleshooting/xp_on_macos.md
     - Troubleshoot installation and 1st start: troubleshooting/first_install.md
     - Troubleshoot voice: troubleshooting/voice.md