feat: enable global installation

[kylo252]

Description

• feat: enable global installation by ensuring that $LUNARVIM_BASE_DIR is independent of $LUNARVIM_RUNTIME_DIR thus allowing system-wide installations
• feat: automatically create missing user-config
• fix(git): refuse updating without write-access

Related: #1791, #1021, #1511, #832, #2944

How Has This Been Tested?

• update your lvim shim and make sure that lvim still starts correctly

  # ...
  export LUNARVIM_BASE_DIR="${LUNARVIM_BASE_DIR:-"$LUNARVIM_RUNTIME_DIR/lvim"}"
  
  exec -a lvim nvim -u "$LUNARVIM_BASE_DIR/init.lua" "$@"

• remove your config.lua and re-open lvim

[abzcoding]

it shows this weird error, but it works nevertheless

[kylo252]

it shows this weird error, but it works nevertheless

@abzcoding, make sure to switch the shebang at the top, see bc4212b

[abzcoding]

it shows this weird error, but it works nevertheless

@abzcoding, make sure to switch the shebang at the top, see bc4212b

yep fixed, thanks 👍