docs: enrich issue template chooser with contact links

[hasansezertasan]

Description

Adds a contact_links block to .github/ISSUE_TEMPLATE/config.yaml so the issue chooser points users to Documentation, the Website, and Discord before they open an issue.

Adapted from #16, with two corrections:

• Fixed the config key. Litestarification #16 used blank_lines_enabled: true, which is not a valid GitHub key (only blank_issues_enabled is recognized) — it was silently ignored and would have defaulted blank issues back to enabled. This PR keeps the correct blank_issues_enabled: false, preserving current behavior.
• Modern Discord invite (discord.gg/litestar).

Validated as parseable YAML with the expected keys.

Closes

• Closes docs: enrich issue template chooser with contact links #30

Summary by Sourcery

Documentation:

• Update issue template configuration to surface documentation, website, and Discord contact options in the issue chooser.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds GitHub issue template contact links while preserving the existing behavior of disallowing blank issues.

File-Level Changes

Change	Details	Files
Introduce contact links in the GitHub issue template chooser to direct users to documentation, website, and Discord before filing issues.	Keeps blank issue behavior unchanged with blank_issues_enabled: false. Adds a contact_links section configured with three entries: Litestar Documentation, Litestar Website, and Discord. Uses the modern Discord invite URL format (discord.gg/litestar). Ensures the YAML structure matches GitHub’s expected issue template config schema.	.github/ISSUE_TEMPLATE/config.yaml

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#30	Add contact_links (Litestar Documentation, Litestar Website, Discord) to .github/ISSUE_TEMPLATE/config.yaml so the issue template chooser routes users appropriately before opening an issue.	✅
#30	Preserve blank_issues_enabled: false in .github/ISSUE_TEMPLATE/config.yaml while adding the new configuration.	✅
#30	Update the stale discord.gg/MmcwxztmQb invite in pyproject.toml to the modern discord.gg/litestar invite.	❌	The PR only modifies .github/ISSUE_TEMPLATE/config.yaml and does not change pyproject.toml, so any outdated Discord invite there remains unchanged.

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