fix(docs): Adding additional step for generating database schema in CONTRIBUTING.md

[Furbreeze]

When following the steps in CONTRIBUTING.md I ran into the following error:

[web] The table `public.UserToOrg` does not exist in the current database.
[web]     at <unknown> (src/initialize.ts:15:46)
[web]     at async pruneOldGuestUser (src/initialize.ts:15:23)
[web]     at async initSingleTenancy (src/initialize.ts:41:5)
[web]     at async (src/initialize.ts:103:9)
[web]   13 | const pruneOldGuestUser = async () => {
[web]   14 |     // The old guest user doesn't have the GUEST role
[web] > 15 |     const guestUser = await prisma.userToOrg.findUnique({
[web]      |                                              ^
[web]   16 |         where: {
[web]   17 |             orgId_userId: {
[web]   18 |                 orgId: SINGLE_TENANT_ORG_ID, {
[web]   code: 'P2021',
[web]   clientVersion: '6.2.1',
[web]   meta: [Object]
[web] }

Simple PR to add the following to CONTRIBUTING.md

6. Generate the database schema.
    ```sh
    yarn dev:prisma:migrate:dev
    ```

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[brendan-kellam]

Good catch thanks!