fix issue #63 and other minor changes

[thebigbone]

Fix build script, update deployment documentation and correct the wrong subnet in deployment file

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: #63

There is an error while running build.sh. Using the correct package manager solves it which is what I did in this PR.

I have also updated deployment.rst file which specifies that the user has to copy the example docker-compose and rename it as docker-compose.yml. After which, the user would be able to run the command to start deployment.

The last change is in the docker-compose.yml file where the subnet is wrong. It should be 172.16.1.0 instead of 172.16.1.1.

What is the new behavior?

• Build script will successfully create docker images.
• Correct subnet is assigned.
• Updated docs.

[verovaleros]

There is no description on the PR. If you want the PR to be considered, please follow the guidelines here: https://github.com/stratosphereips/AIVPN/blob/main/.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

[thebigbone]

Updated the description. Apologies for not including a proper description.

[verovaleros]

Thanks. Another thing, please review our contributing guidelines, you always need to PR to development, not to main. Please change it and make sure the changes are still valid given there were some changes already that I think may overlap.

[thebigbone]

I will remove the build script PR as you have already resolved it in the develop branch.

[thebigbone]

I have changed the branch. Can you check it?