refactor!: extract mason-lspconfig to separate plugin (#109)

The rationale behind this is to make boundaries clearer as mason.nvim
has no direct relation with lspconfig per se.

Also, hopefully, by having it as a separate package like this would
encourage more people to write similar extensions (think mason-dap and
mason-null-ls). Ideally such extensions wouldn't be required at all, but
there are definitely gaps to fill as of today.

From now on you'll need to add `williamboman/mason-lspconfig.nvim` as
a plugin if you want to use the `mason-lspconfig` extension:

```lua
use {
    { "williamboman/mason.nvim", branch = "alpha" },
    "williamboman/mason-lspconfig.nvim",
    "neovim/nvim-lspconfig",
}
```

```lua
Plug "williamboman/mason.nvim", { 'branch': 'alpha' }
Plug "williamboman/mason-lspconfig.nvim"
Plug "neovim/nvim-lspconfig"
```

1 files changed, 1 insertions, 2 deletions

diff --git a/.github/ISSUE_TEMPLATE/package_issue.yaml b/.github/ISSUE_TEMPLATE/package_issue.yaml
index 8becb220..b8ca7132 100644
--- a/.github/ISSUE_TEMPLATE/package_issue.yaml
+++ b/.github/ISSUE_TEMPLATE/package_issue.yaml
@@ -65,9 +65,8 @@ body:
     - type: textarea
       attributes:
           label: Steps to reproduce
-          description: Steps to reproduce using the **minimal debug** config. You can download it [from here](https://github.com/williamboman/mason.nvim/blob/main/tests/minimal_debug_init.lua).
           placeholder: |
-              1. Start neovim using the minimal_debug_init.lua: `nvim -u ~/Downloads/minimal_debug_init.lua`
+              1. ...
               2. ...
       validations:
           required: true