Fix broken or remove outdated links in docs

[fenek]

This PR addresses #1555

• Removes Roadmap page as it is heavily outdated and even if we restore it, most probably will have to be written from scratch.

[mongoose-im]

6081.1 / Erlang 19.3 / small_tests / 0ab7119
Reports root / small

---

6081.2 / Erlang 19.3 / internal_mnesia / 0ab7119
Reports root/ big
OK: 1173 / Failed: 0 / User-skipped: 52 / Auto-skipped: 0

---

6081.3 / Erlang 19.3 / mysql_redis / 0ab7119
Reports root/ big
OK: 2944 / Failed: 0 / User-skipped: 223 / Auto-skipped: 0

---

6081.4 / Erlang 19.3 / odbc_mssql_mnesia / 0ab7119
Reports root/ big
OK: 2958 / Failed: 0 / User-skipped: 209 / Auto-skipped: 0

---

6081.6 / Erlang 19.3 / elasticsearch_and_cassandra_mnesia / 0ab7119
Reports root/ big
OK: 445 / Failed: 0 / User-skipped: 8 / Auto-skipped: 0

---

6081.5 / Erlang 19.3 / ldap_mnesia / 0ab7119
Reports root/ big
OK: 1137 / Failed: 0 / User-skipped: 88 / Auto-skipped: 0

---

6081.8 / Erlang 20.0 / pgsql_mnesia / 0ab7119
Reports root/ big / small
OK: 2990 / Failed: 0 / User-skipped: 177 / Auto-skipped: 0

---

6081.9 / Erlang 21.0 / riak_mnesia / 0ab7119
Reports root/ big / small
OK: 1411 / Failed: 1 / User-skipped: 50 / Auto-skipped: 0

pubsub_SUITE:tree+basic:retract_when_user_goes_offline_test

{error,
  {function_clause,
    [{lists,zip,
       [[{xmlel,<<"item">>,
           [{<<"id">>,<<"item1">>}],
           [{xmlel,<<"entry">>,
            [{<<"xmlns">>,<<"http://www.w3.org/2005/Atom">>}],
            []}]}],
        []],
       [{file,"lists.erl"},{line,387}]},
     {lists,zip,2,[{file,"lists.erl"},{line,387}]},
     {pubsub_tools,check_items,3,[{file,"pubsub_tools.erl"},{line,539}]},
     {pubsub_SUITE,'-retract_when_user_goes_offline_test/1-fun-0-',3,
       [{file,"pubsub_SUITE.erl"},{line,649}]},
     {escalus_story,story,4,
       [{file,
          "/home/travis/build/esl/MongooseIM/big_tests/_build/default/lib/escalus/src/escalus_story.erl"},
        {line,72}]},
     {test_server,ts_tc,3,[{file,"test_server.erl"},{line,1545}]},
     {test_server,run_test_case_eval1,6,
       [{file,"test_server.erl"},{line,1063}]},
     {test_server,run_test_case_eval,9,
       [{file,"test_server.erl"},{line,995}]}]}}

Report log

---

6081.9 / Erlang 21.0 / riak_mnesia / 0ab7119
Reports root/ big / small
OK: 1399 / Failed: 1 / User-skipped: 50 / Auto-skipped: 0

mod_global_distrib_SUITE:multi_connection:test_muc_conversation_history

{error,{{assertEqual,[{module,mod_global_distrib_SUITE},
            {line,420},
            {expression,"exml_query : attr ( AlicePresence , << \"from\" >> )"},
            {expected,<<"[email protected]/alicE73.663229">>},
            {value,<<"[email protected]/eve73.715928">>}]},
    [{mod_global_distrib_SUITE,'-test_muc_conversation_history/1-fun-1-',
                   3,
                   [{file,"mod_global_distrib_SUITE.erl"},
                  {line,420}]},
     {mod_global_distrib_SUITE,'-test_muc_conversation_history/1-fun-5-',
                   3,
                   [{file,"mod_global_distrib_SUITE.erl"},
                  {line,419}]},
     {escalus_story,story,4,
            [{file,"/home/travis/build/esl/MongooseIM/big_tests/_build/default/lib/escalus/src/escalus_story.erl"},
             {line,72}]},
     {mod_global_distrib_SUITE,test_muc_conversation_history,1,
                   [{file,"mod_global_distrib_SUITE.erl"},
                  {line,392}]},
     {test_server,ts_tc,3,[{file,"test_server.erl"},{line,1545}]},
     {test_server,run_test_case_eval1,6,
            [{file,"test_server.erl"},{line,1063}]},
     {test_server,run_test_case_eval,9,
            [{file,"test_server.erl"},{line,995}]}]}}

Report log

[codecov]

Codecov Report

Merging #2183 into master will decrease coverage by 15.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2183      +/-   ##
==========================================
- Coverage   78.62%   63.52%   -15.1%     
==========================================
  Files         329      329              
  Lines       28426    28423       -3     
==========================================
- Hits        22349    18057    -4292     
- Misses       6077    10366    +4289

Impacted Files	Coverage Δ
src/mod_auth_token_rdbms.erl	0% <0%> (-100%)	⬇️
src/mod_aws_sns.erl	0% <0%> (-100%)	⬇️
src/inbox/mod_inbox_rdbms_mysql.erl	0% <0%> (-100%)	⬇️
src/mam/mam_message_compressed_eterm.erl	0% <0%> (-100%)	⬇️
src/inbox/mod_inbox_muclight.erl	0% <0%> (-100%)	⬇️
src/inbox/mod_inbox_rdbms_pgsql.erl	0% <0%> (-100%)	⬇️
src/mam/mam_jid.erl	0% <0%> (-100%)	⬇️
src/mam/mam_jid_mini.erl	0% <0%> (-100%)	⬇️
src/inbox/mod_inbox_one2one.erl	0% <0%> (-100%)	⬇️
src/inbox/mod_inbox_rdbms_mssql.erl	0% <0%> (-100%)	⬇️
... and 94 more

---

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