docs: replace gitter links with discord

[Selflocking]

resolved: https://github.com/casbin/casbin-website-v2/issues/179

[codecov[bot]]

Codecov Report

Merging #311 (07a3384) into master (2bd7ef5) will decrease coverage by 0.25%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
- Coverage   67.34%   67.09%   -0.25%     
==========================================
  Files          24       24              
  Lines        1779     1778       -1     
==========================================
- Hits         1198     1193       -5     
- Misses        581      585       +4     

see 5 files with indirect coverage changes

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[github-actions[bot]]

Benchmark for 2bd7ef5

Click to view benchmark

| Test | PR Benchmark | Master Benchmark | % | |------|--------------|------------------|---| | b_benchmark_rbac_model_large | 13.9±0.16ms | **13.6±0.11ms** | **+2.21%** | | benchmark priority model | 7.5±0.04µs | **7.3±0.07µs** | **+2.74%** | | benchmark_abac_model | 3.6±0.02µs | 3.6±0.04µs | 0.00% | | benchmark_basic_model | 6.4±0.03µs | 6.4±0.04µs | 0.00% | | benchmark_key_match | 11.9±0.09µs | 11.9±0.11µs | 0.00% | | benchmark_rbac_model | 10.4±0.06µs | **10.1±0.06µs** | **+2.97%** | | benchmark_rbac_model_medium | **1237.8±11.84µs** | 1248.4±9.62µs | **-0.85%** | | benchmark_rbac_model_with_domains | 10.3±0.05µs | **10.2±0.08µs** | **+0.98%** | | benchmark_rbac_with_deny | **13.5±0.06µs** | 13.9±0.05µs | **-2.88%** | | benchmark_rbac_with_resource_roles | 7.7±0.07µs | 7.7±0.05µs | 0.00% | | benchmark_role_manager_large | **5.8±0.03ms** | 5.9±0.04ms | **-1.69%** | | benchmark_role_manager_medium | **503.2±3.77µs** | 509.4±3.17µs | **-1.22%** | | benchmark_role_manager_small | 131.2±1.18µs | **129.1±1.06µs** | **+1.63%** |